Add readme documentation

.gitignore

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+# Local .terraform directories
+**/.terraform/
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# .tfplan files
+*.tfplan
+
+# Crash log files
+crash.log
+
+# .tfvars files that are meant to be customized
+*.auto.tfvars
+*.auto.tfvars.json
+
+# Local .git directories
+**/.git/
+
+# Lock file
+.terraform.lock.*

README.md

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-# infra-terraform-aws
-Terraform code to setup AWS infra
+# Terraform AWS infra
+
+## Architecture Design
+
+![design](design.png)
+
+## Setup
+
+- To download `terraform`, please follow steps mentioned [here](https://spacelift.io/blog/how-to-install-terraform). Make sure you set the environment variable(s).
+- Verify if `terraform` has been installed and configure by executing `terraform -v`.
+- Install `AWS CLI` from [here](https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html).
+- Verify if `AWS CLI` has been installed and configued by executing `aws --version`.
+- Log in to `AWS Web Console`
+  - If user exists, then go to `IAM` -> `Users` -> `<user>` -> `Security Credential` -> `Access keys` -> `Create access key` and note down `Access Key ID` and `Secret Access Key`.
+  - If user doesn't exist then create a user with `programmatic access` to AWS and note down `Access Key ID` and `Secret Access Key`.
+- Next step is to configure these credentials in the `AWS CLI` by executing `aws configure`. Enter `Access Key ID` and `Secret Access Key`, keep everything else default.
+
+## Usages
+
+- Go to `projects\my-project\staging` directory.
+- Execute `terraform init -backend-config="backend.conf"` command to prepare working directory.
+- Execute `terraform plan` to show changes which are required to be performed.
+- Execute `terraform apply` to create or update infrastructure.
+- Please check other below mentioned commands to be executed:
+
+```
+Usage: terraform [global options] <subcommand> [args]
+
+The available commands for execution are listed below.
+The primary workflow commands are given first, followed by
+less common or more advanced commands.
+
+Main commands:
+  init          Prepare your working directory for other commands
+  validate      Check whether the configuration is valid
+  plan          Show changes required by the current configuration
+  apply         Create or update infrastructure
+  destroy       Destroy previously-created infrastructure
+
+All other commands:
+  console       Try Terraform expressions at an interactive command prompt
+  fmt           Reformat your configuration in the standard style
+  force-unlock  Release a stuck lock on the current workspace
+  get           Install or upgrade remote Terraform modules
+  graph         Generate a Graphviz graph of the steps in an operation
+  import        Associate existing infrastructure with a Terraform resource
+  login         Obtain and save credentials for a remote host
+  logout        Remove locally-stored credentials for a remote host
+  metadata      Metadata related commands
+  output        Show output values from your root module
+  providers     Show the providers required for this configuration
+  refresh       Update the state to match remote systems
+  show          Show the current state or a saved plan
+  state         Advanced state management
+  taint         Mark a resource instance as not fully functional
+  untaint       Remove the 'tainted' state from a resource instance
+  version       Show the current Terraform version
+  workspace     Workspace management
+
+Global options (use these before the subcommand, if any):
+  -chdir=DIR    Switch to a different working directory before executing the
+                given subcommand.
+  -help         Show this help output, or the help for a specified subcommand.
+  -version      An alias for the "version" subcommand.
+```
+
+## Infracost
+
+- To download `infracost`, please follow the instructions mentioned [here](https://www.infracost.io/docs/).
+- Go to `projects\my-project\staging` directory.
+- Execute `infracost breakdown --path .` to see the cost.
+- Please refer official document for more detailed commands.