Added usage example

README.md

@@ -14,6 +14,35 @@ A GitHub action for styling files with [prettier](prettier.io).
 | file_pattern | :x: | '*' | Custom git add file pattern |
 | branch | :white_check_mark: | - | Custom git publish branch, use ${{ github.head_ref }} if used in pull requests |
 
+### Example Config
+
+This is a small example of what your `action.yml` could look like:
+
+```yaml
+name: Prettier for JS Code
+
+on: [pull_request]
+
+jobs:
+  cleanup_tasks:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Cloning the repository
+      uses: actions/checkout@v1
+      with:
+        fetch-depth: 1
+    - name: Prettify the JS Code
+      uses: creyD/prettier_action@v1.0
+      with:
+        prettier_options: '--no-semi --write src/**/*.js'
+        branch: ${{ github.head_ref }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+```
+
+This simple example executes `prettier --no-semi --write src/**/*.js` after someone created a Pull Request on your repository. More documentation can be found [here](https://help.github.com/en/actions/automating-your-workflow-with-github-actions/workflow-syntax-for-github-actions).
+
 ## Issues
 
 Please report all bugs and feature request using the [GitHub issues function](https://github.com/creyD/prettier_action/issues/new).