Support collaborators PR template (#14023)

* add collaborator tmpl

* update tmpl

* update read me

* fix markdown style

* update readme

.github/PULL_REQUEST_TEMPLATE/collaborator.md

@@ -0,0 +1,33 @@
+### This is a ...
+
+- [ ] New feature
+- [ ] Other
+
+### What's the background?
+  
+> 1. Describe the source of requirement.
+> 2. Resolve what problem.
+> 3. Related issue link.
+  
+### API Realization
+  
+> 1. Basic thought of solution and other optional proposal.
+> 2. List final API realization and usage sample.
+> 3. GIF or snapshot should be provided if includes UI/interactive modification.
+  
+### What's the affect?
+
+> 1. Does this PR affect user? Which part will be affected?
+> 2. What will say in changelog?
+> 3. Does this PR contains potential break change or other risk?
+
+### Self Check before Merge
+
+- [ ] Doc is ready or not need
+- [ ] Demo is provided or not need
+- [ ] TypeScript definition is ready or not need
+- [ ] Changelog provided
+
+### Additional Plan?
+
+> If this PR related with other PR or following info. You can type here.

README.md

@@ -110,4 +110,6 @@ Read our [contributing guide](https://ant.design/docs/react/contributing) and le
 
 We welcome all contributions. Please read our [CONTRIBUTING.md](https://github.com/ant-design/ant-design/blob/master/.github/CONTRIBUTING.md) first. You can submit any ideas as [pull requests](https://github.com/ant-design/ant-design/pulls) or as [GitHub issues](https://github.com/ant-design/ant-design/issues). If you'd like to improve code, check out the [Development Instructions](https://github.com/ant-design/ant-design/wiki/Development) and have a good time! :)
 
+If you are collaborator. Please follow our [Pull Request principle](https://github.com/ant-design/ant-design/wiki/PR-principle) to create Pull Request by [collaborator template](https://github.com/ant-design/ant-design/compare?expand=1&template=collaborator.md).
+
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