docs: update readme.md

README.md

@@ -2,4 +2,24 @@
 A GitHub bot powered by OpenAI for code review on pull requests.
 
 ## usage
-.....WIP
+```yaml
+name: Code review using rebotai
+on:
+  issue_comment:
+    types: [created]
+
+jobs: 
+  test_code_review:
+    if: >
+      github.event.issue.pull_request != null &&
+      contains(github.event.comment.body, '/review')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: fiqryq/rebotai@{version}
+        with:
+          gh-token: ${{ secrets.GH_TOKEN }}
+          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
+```
+
+## example response 
+![CleanShot 2024-05-19 at 13 04 40](https://github.com/fiqryq/rebotai/assets/25787603/3cad6a1b-6f1f-4d85-9eb2-86a36acacc8b)