Add README

README.md

@@ -1,2 +1,26 @@
 # falco-github-action
-Falco GitHub Action for VCL validation at CI level
+
+Falco GitHub Action for VCL validation.
+
+## Usage
+
+```yaml
+      - name: Lint VCL
+        uses: ain/falco-github-action@latest
+        with:
+          subcommand: lint
+          options: "-v -I test/vcl/includes"
+          target: test/vcl/valid_with_include.vcl
+```
+
+## Inputs
+
+| Input | Default | Description |
+| ----- | ------- | ----------- |
+| `subdommand` | `lint` | Run linting on VCL (or ACL) |
+| `options` | - | Optional flags, see [Common Flags of Falco](https://github.com/ysugimoto/falco#usage) |
+| `target` | - | VCL (or ACL) to targeted, e.g. lint |
+
+## Licence
+
+Copyright © 2023 Ain Tohvri. Licenced under [MIT](LICENSE).