Add an example image for github-pr-check on GitHub Action from forked repo
@@ -259,6 +259,7 @@ Requests from fork repository because due to [GitHub Actions
restriction](https://help.github.com/en/articles/virtual-environments-for-github-actions#github_token-secret),
`GITHUB_TOKEN` for PullRequest from forked repository doesn't have write access
to Check API.
+[![github-pr-check from forked repo example](https://user-images.githubusercontent.com/3797062/64907277-2a044800-d72b-11e9-82b1-f739414f9d48.png)](https://github.com/reviewdog/reviewdog/pull/281/checks?check_run_id=222108016#step:7:15)
#### Option 2) Install reviewdog GitHub Apps
reviewdog CLI send a request to reviewdog GitHub App server and the server post
