Create PULL_REQUEST_TEMPLATE.md

Author: Kyaa-dost

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes #
+<!-- Link to relevant issue (for ex: #1234) which will automatically close the issue once the PR is merged -->
+
+## PR Type
+What kind of change does this PR introduce?
+<!-- Please uncomment one ore more that apply to this PR -->
+
+<!-- - Bugfix -->
+<!-- - Feature -->
+<!-- - Code style update (formatting) -->
+<!-- - Refactoring (no functional changes, no api changes) -->
+<!-- - Build or CI related changes -->
+<!-- - Documentation content changes -->
+<!-- - Sample app changes -->
+<!-- - Other... Please describe: -->
+
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+
+## What is the new behavior?
+
+
+## PR Checklist
+
+Please check if your PR fulfills the following requirements:
+
+- [ ] Tested code with current [supported SDKs](../readme.md#supported)
+- [ ] Pull Request has been submitted to the documentation repository [instructions](..\contributing.md#docs). Link: <!-- docs PR link -->
+- [ ] Sample in sample app has been added / updated (for bug fixes / features)
+    - [ ] Icon has been created (if new sample) following the [Thumbnail Style Guide and templates](https://github.com/windows-toolkit/WindowsCommunityToolkit-design-assets)
+- [ ] Tests for the changes have been added (for bug fixes / features) (if applicable)
+- [ ] Header has been added to all new source files (run *build/UpdateHeaders.bat*)
+- [ ] Contains **NO** breaking changes
+
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. 
+     Please note that breaking changes are likely to be rejected -->
+
+
+## Other information