docs: update readme.md

README.md

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-## rebotai
-A GitHub bot powered by OpenAI for code review on pull requests.
+# Rebotai
+Rebotai is a GitHub bot powered by OpenAI that performs code reviews on pull requests.
 
-## usage
-.....WIP
+## Usage
+To integrate Rebotai into your GitHub repository, follow these steps:
+
+1. **Add Repository Secrets:**
+   Go to your repository settings and add the following secrets:
+   - `GH_TOKEN`: Your GitHub token
+   - `OPENAI_API_KEY`: Your OpenAI API key
+
+2. **Add Repository Variables:**
+   Add the following variables:
+   - `MODEL`: The OpenAI model to use (e.g., `gpt-3.5-turbo`)
+   - `LANGUAGE`: The preferred language for responses (e.g., `indonesia`)
+
+3. **Add GitHub Actions Workflow:**
+   Create a new GitHub Actions workflow file (e.g., `.github/workflows/rebotai.yml`) with the following content:
+
+   ```yaml
+   name: Rebotai Code Review
+   on:
+     issue_comment:
+       types: [created]
+
+   jobs: 
+     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 }}
+             model: ${{ vars.MODEL }}
+             language: ${{ vars.LANGUAGE }}
+   ```
+
+## Example Responses
+Here are examples of responses in different languages based on the configured `LANGUAGE` variable:
+
+### Japanese
+```yaml
+language: ${{ vars.LANGUAGE }} # japan
+```
+![Japanese Response](https://github.com/fiqryq/rebotai/assets/25787603/39253993-82a2-4bbb-9543-335c1bd22f60)
+
+### Indonesian
+```yaml
+language: ${{ vars.LANGUAGE }} # indonesia
+```
+![Indonesian Response](https://github.com/fiqryq/rebotai/assets/25787603/129a4459-a49f-4397-b560-b92497da9276)
+
+### English
+```yaml
+language: ${{ vars.LANGUAGE }} # english
+```
+![English Response](https://github.com/fiqryq/rebotai/assets/25787603/08b35930-9e99-4319-af9a-1a7500117544)
+
+## Contributing
+We welcome contributions! Please feel free to submit issues or pull requests to improve Rebotai.
+
+## License
+This project is licensed under the MIT License.