init pull request template

Signed-off-by: wbc6080 <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

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+<!--  Thanks for sending a pull request!  Here are some tips for you:
+
+1. If this is your first time, please read our contributor guidelines: https://github.com/kubeedge/kubeedge/blob/master/CONTRIBUTING.md
+2. Ensure you have added or ran the appropriate tests for your PR
+
+-->
+
+**What type of PR is this?**
+
+<!--
+Add one of the following kinds:
+/kind bug
+/kind cleanup
+/kind documentation
+/kind feature
+/kind test
+/kind design
+
+Optionally add one or more of the following kinds if applicable:
+/kind api-change
+/kind failing-test
+-->
+
+
+**What this PR does / why we need it**:
+
+**Which issue(s) this PR fixes**:
+<!--
+*Automatically closes linked issue when PR is merged.
+Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
+_If PR is about `failing-tests or flakes`, please post the related issues/tests in a comment and do not use `Fixes`_*
+-->
+Fixes #
+
+**Special notes for your reviewer**:
+
+**Does this PR introduce a user-facing change?**:
+<!--
+If no, just write "NONE" in the release-note block below.
+If yes, a release note is required:
+Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
+-->
+```release-note
+
+```