diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
new file mode 100644
index 0000000..37a9318
--- /dev/null
+++ b/.github/workflows/main.yml
@@ -0,0 +1,27 @@
+name: Ruby
+
+on:
+  push:
+    branches:
+      - main
+
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: Ruby ${{ matrix.ruby }}
+    strategy:
+      matrix:
+        ruby:
+          - '3.3.0'
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true
+    - name: Run the default task
+      run: bundle exec rake
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b04a8c8
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+
+# rspec failure tracking
+.rspec_status
diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..34c5164
--- /dev/null
+++ b/.rspec
@@ -0,0 +1,3 @@
+--format documentation
+--color
+--require spec_helper
diff --git a/.rubocop.yml b/.rubocop.yml
new file mode 100644
index 0000000..e3462a7
--- /dev/null
+++ b/.rubocop.yml
@@ -0,0 +1,13 @@
+AllCops:
+  TargetRubyVersion: 2.6
+
+Style/StringLiterals:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+Style/StringLiteralsInInterpolation:
+  Enabled: true
+  EnforcedStyle: double_quotes
+
+Layout/LineLength:
+  Max: 120
diff --git a/Gemfile b/Gemfile
new file mode 100644
index 0000000..1a6b690
--- /dev/null
+++ b/Gemfile
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# Specify your gem's dependencies in jekyll-securitytxt.gemspec
+gemspec
+
+gem "rake", "~> 13.0"
+
+gem "rspec", "~> 3.0"
+
+gem "rubocop", "~> 1.21"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6c98b76
--- /dev/null
+++ b/README.md
@@ -0,0 +1,32 @@
+# Jekyll::Securitytxt
+
+TODO: Delete this and the text below, and describe your gem
+
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/jekyll/securitytxt`. To experiment with that code, run `bin/console` for an interactive prompt.
+
+## Installation
+
+TODO: Replace `UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG` with your gem name right after releasing it to RubyGems.org. Please do not do it earlier due to security reasons. Alternatively, replace this section with instructions to install your gem from git if you don't plan to release to RubyGems.org.
+
+Install the gem and add to the application's Gemfile by executing:
+
+    $ bundle add UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG
+
+If bundler is not being used to manage dependencies, install the gem by executing:
+
+    $ gem install UPDATE_WITH_YOUR_GEM_NAME_IMMEDIATELY_AFTER_RELEASE_TO_RUBYGEMS_ORG
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and the created tag, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/jekyll-securitytxt.
+# jekyll-securitytxt
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 0000000..cca7175
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+require "rubocop/rake_task"
+
+RuboCop::RakeTask.new
+
+task default: %i[spec rubocop]
diff --git a/bin/console b/bin/console
new file mode 100755
index 0000000..1d5ef4f
--- /dev/null
+++ b/bin/console
@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "bundler/setup"
+require "jekyll/securitytxt"
+
+# You can add fixtures and/or initialization code here to make experimenting
+# with your gem easier. You can also use a different console, if you like.
+
+require "irb"
+IRB.start(__FILE__)
diff --git a/bin/setup b/bin/setup
new file mode 100755
index 0000000..dce67d8
--- /dev/null
+++ b/bin/setup
@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+set -euo pipefail
+IFS=$'\n\t'
+set -vx
+
+bundle install
+
+# Do any other automated setup that you need to do here
diff --git a/jekyll-securitytxt.gemspec b/jekyll-securitytxt.gemspec
new file mode 100644
index 0000000..754c554
--- /dev/null
+++ b/jekyll-securitytxt.gemspec
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require_relative "lib/jekyll/securitytxt/version"
+
+Gem::Specification.new do |spec|
+  spec.name = "jekyll-securitytxt"
+  spec.version = Jekyll::Securitytxt::VERSION
+  spec.authors = ["HAHWUL"]
+  spec.email = ["hahwul@gmail.com"]
+
+  spec.summary = "TODO: Write a short summary, because RubyGems requires one."
+  spec.description = "TODO: Write a longer description or delete this line."
+  spec.homepage = "TODO: Put your gem's website or public repo URL here."
+  spec.required_ruby_version = ">= 2.6.0"
+
+  spec.metadata["allowed_push_host"] = "TODO: Set to your gem server 'https://example.com'"
+
+  spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = "TODO: Put your gem's public repo URL here."
+  spec.metadata["changelog_uri"] = "TODO: Put your gem's CHANGELOG.md URL here."
+
+  # Specify which files should be added to the gem when it is released.
+  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
+  spec.files = Dir.chdir(__dir__) do
+    `git ls-files -z`.split("\x0").reject do |f|
+      (File.expand_path(f) == __FILE__) ||
+        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile])
+    end
+  end
+  spec.bindir = "exe"
+  spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
+  spec.require_paths = ["lib"]
+
+  # Uncomment to register a new dependency of your gem
+  # spec.add_dependency "example-gem", "~> 1.0"
+
+  # For more information and examples about making a new gem, check out our
+  # guide at: https://bundler.io/guides/creating_gem.html
+end
diff --git a/lib/jekyll/securitytxt.rb b/lib/jekyll/securitytxt.rb
new file mode 100644
index 0000000..ddcc66a
--- /dev/null
+++ b/lib/jekyll/securitytxt.rb
@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+require_relative "securitytxt/version"
+
+module Jekyll
+  module Securitytxt
+    class Error < StandardError; end
+    # Your code goes here...
+  end
+end
diff --git a/lib/jekyll/securitytxt/version.rb b/lib/jekyll/securitytxt/version.rb
new file mode 100644
index 0000000..0414a5a
--- /dev/null
+++ b/lib/jekyll/securitytxt/version.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module Jekyll
+  module Securitytxt
+    VERSION = "0.1.0"
+  end
+end
diff --git a/sig/jekyll/securitytxt.rbs b/sig/jekyll/securitytxt.rbs
new file mode 100644
index 0000000..098572f
--- /dev/null
+++ b/sig/jekyll/securitytxt.rbs
@@ -0,0 +1,6 @@
+module Jekyll
+  module Securitytxt
+    VERSION: String
+    # See the writing guide of rbs: https://github.com/ruby/rbs#guides
+  end
+end
diff --git a/spec/jekyll/securitytxt_spec.rb b/spec/jekyll/securitytxt_spec.rb
new file mode 100644
index 0000000..ff88365
--- /dev/null
+++ b/spec/jekyll/securitytxt_spec.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+RSpec.describe Jekyll::Securitytxt do
+  it "has a version number" do
+    expect(Jekyll::Securitytxt::VERSION).not_to be nil
+  end
+
+  it "does something useful" do
+    expect(false).to eq(true)
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..71a509e
--- /dev/null
+++ b/spec/spec_helper.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require "jekyll/securitytxt"
+
+RSpec.configure do |config|
+  # Enable flags like --only-failures and --next-failure
+  config.example_status_persistence_file_path = ".rspec_status"
+
+  # Disable RSpec exposing methods globally on `Module` and `main`
+  config.disable_monkey_patching!
+
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+end