chore: update doc

README.md

@@ -4,12 +4,20 @@ Github action for update description on repository.
 
 ## Usage
 
+- [Example](./.github/workflows/main.yml)
+
 ```yaml
 uses: zhengbangbo/[email protected]
 with:
   repo: ${{ github.repository }}
+  repo-token: ${{ secrets.MY_TOKEN }}
 ```
 
+> **Note**
+> 1. Creat [PAT(Personal access token)](https://github.com/settings/tokens) and set `actions secrets` of repository.
+> 2. If `repo-token` use `secrets.GITHUB_TOKEN` or `github.token`, throw `Error: Resource not accessible by integration`. Like [this job](https://github.com/zhengbangbo/update-repository-description/actions/runs/3318862036/jobs/5483297578).
+
+
 ## License
 
 MIT