docs: update README

Author: staevs

README.md

@@ -1,9 +1,45 @@
 # GitHub Action to Sync S3 Bucket and invalidate CloudFront Cache
 
-Uses official [amazon/aws-cli](https://hub.docker.com/r/amazon/aws-cli) Docker image to sync a directory with a S3 bucket.
+> Uses official [amazon/aws-cli](https://hub.docker.com/r/amazon/aws-cli) Docker image to sync a directory with a S3 bucket.
 
 Before start configure your [AWS credentials](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html#cli-configure-quickstart-creds-create)
 
+## Usage
+
+Example `workflow.yml`:
+
+```yaml
+
+name: S3 Deployment
+on: push
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Build App
+        run: npm run build
+      - name: S3/CloudFront Deploy
+        uses: staevs/[email protected]
+        if: success()
+        with:
+          args: --follow-symlinks --delete --no-progress
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_REGION: ${{ secrets.AWS_REGION }}
+          AWS_S3_BUCKET: ${{ secrets.AWS_S3_BUCKET }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          CLOUDFRONT_DISTRIBUTION_ID: ${{ secrets.CLOUDFRONT_DISTRIBUTION_ID }}
+          S3_SOURCE_DIR: 'build'
+```
+
+## Configuration
+
+> `args` would be passed directly to `aws s3` invocation. Refer to: [AWS S3 docs](https://docs.aws.amazon.com/cli/latest/userguide/cli-services-s3.html)
 
 | Environment Variable       | Required                    | Description                                                                                                      | 
 |----------------------------|-----------------------------|------------------------------------------------------------------------------------------------------------------|