feat(supported-version): add user-defined kind (#28)

`kind` is a new input property for the `supported-version` action which
allows one to define what specific versions of Magento they support.

Currently, `kind` supports `latest`, `currently-supported`, and `custom`. See the
README for `supported-version` if you want more specifics

supported-version/README.md

@@ -7,6 +7,15 @@ All data comes from:
 - [v2.3](https://github.com/magento/devdocs/blob/master/src/_data/codebase/v2_3/system-requirements.yml)
 - [v2.4](https://github.com/magento/devdocs/blob/master/src/_data/codebase/v2_4/system-requirements.yml)
 
+## Inputs
+
+See the [action.yml](./action.yml)
+
+| Input           | Description                                                                                                                                                  | Required | Default     |
+| --------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- | ----------- |
+| kind            | The "kind" of support you're targeting for your package. Allowed values are `currently-supported`, `latest` and `custom`                                     | false    | 'currently-supported' |
+| custom_versions | The versions you want to support, as a comma-separated string, i.e. 'magento/project-community-edition:2.3.7-p3, magento/project-community-edition:2.4.2-p2' | false    | ''          |
+
 ## Usage
 
 ```yml
@@ -30,14 +39,4 @@ jobs:
       - uses: graycoreio/github-actions-magento2/supported-version@main
         id: supported-version
       - run: echo ${{ steps.supported-version.outputs.matrix }}
-
-  install-test:
-    needs: compute_matrix
-    strategy:
-      matrix: ${{ fromJSON(needs.compute_matrix.outputs.matrix) }}
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - run: echo ${{ matrix.magento }} ${{ matrix.os }} ${{ matrix.php }}
-      shell: bash
 ```