update changelog

Author: rcannood

CHANGELOG.md

@@ -1,3 +1,18 @@
-## Netlify Deploy Github Action v1.0.0
+## Netlify Deploy Pre-rendered Site v1.0.0
 
-* Initial release
+Initial release.
+
+Example usage:
+
+```yaml
+- name: Deploy to Netlify 🚀
+  uses: data-intuitive/netlify-deploy-action@v1
+  with:
+    auth: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+    site: 'my-netlify-site'
+    dir: '_site'
+    prod: true
+    message: 'Deploy production ${{ github.ref }}'
+```
+
+See the README for more information.