Add documentation

.github/workflows/ci.yaml

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+name: ci
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  test:
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    env:
+      VERBOSE: 1
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.20'
+          cache: false
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          args: --timeout 5m0s
+      - name: Run fmt
+        run: go fmt ./...
+      - name: Run vet
+        run: go vet ./...
+      - name: Run tests
+        run: go test -v ./...

CODEOWNERS

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+* @losisin

README.md

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+# helm values schema json plugin
+
+Helm plugin for generating `values.schema.json` from single or multiple values files. Works only with Helm3 charts.
+
+## Install
+
+```bash
+$ helm plugin install https://github.com/losisin/helm-values-schema-json.git
+Installed plugin: schema
+```
+
+## Features
+
+- Add multiple values files and merge them together - required
+- Save output with custom name and location - default is values.schema.json in current working directory
+- Change schema draft version - default is draft 2020-12
+
+## Usage
+
+```bash
+$ helm schema -help
+usage: helm schema [-input STR] [-draft INT] [-output STR]
+  -draft int
+    	Draft version (4, 6, 7, 2019, or 2020) (default 2020)
+  -input value
+    	Multiple yamlFiles as inputs (comma-separated)
+  -output string
+    	Output file path (default "values.schema.json")
+```
+
+### Basic
+
+In most cases you will want to run the plugin with default options:
+
+```bash
+$ helm schema -input values.yaml
+```
+
+This will read `values.yaml`, set draft version to `2020-12` and save outpout to `values.schema.json`.
+
+### Extended
+
+Merge multiple values files, set json-schema draft version explicitly and save output to `my.schema.json`:
+
+`values_1.yaml`
+
+```yaml
+nodeSelector:
+  kubernetes.io/hostname: ""
+dummyList:
+  - "a"
+  - "b"
+  - "c"
+key1: "asd"
+key2: 42
+key3: {}
+key4: []
+```
+
+`custom/path/values_2.yaml`
+
+```yaml
+nodeSelector:
+  kubernetes.io/hostname: "node1"
+deep:
+  deep1:
+    deep2:
+      deep3:
+        deep4: "asdf"
+```
+
+Run the following command to merge the yaml files and output json schema:
+
+```bash
+$ helm schema -input values_1.yaml,custom/path/values_2.yaml -draft 2020 -output my.schema.json
+```
+
+Output will be something like this:
+
+```json
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "type": "object",
+    "properties": {
+        "deep": {
+            "type": "object",
+            "properties": {
+                "deep1": {
+                    "type": "object",
+                    "properties": {
+                        "deep2": {
+                            "type": "object",
+                            "properties": {
+                                "deep3": {
+                                    "type": "object",
+                                    "properties": {
+                                        "deep4": {
+                                            "type": "string"
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        },
+        "dummyList": {
+            "type": "array",
+            "items": {
+                "type": "string"
+            }
+        },
+        "key1": {
+            "type": "string"
+        },
+        "key2": {
+            "type": "integer"
+        },
+        "key3": {
+            "type": "object"
+        },
+        "key4": {
+            "type": "array"
+        },
+        "nodeSelector": {
+            "type": "object",
+            "properties": {
+                "kubernetes.io/hostname": {
+                    "type": "string"
+                }
+            }
+        }
+    }
+}
+```