Updated Readme

Author: fojia

README.md

@@ -4,7 +4,7 @@
 
 This action allows you to use any of
 the [issue](https://help.github.com/en/articles/events-that-trigger-workflows#issues-event-issues) webhook events to
-create project cards. For example when an `issue` is `opened` create a card in the project column.
+create project cards. For example when an `issue` is `opened` create a card in the project column. Or on [pull_request](https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request) close event move all linked issues(note you should link issues in the Development section of PR ) to this PR or children PRs to specific project column. 
 
 ### Issues workflow example
 ```yml