ADD: basic Pull request tempalte

.github/PULL_REQUEST_TEMPLATE.md

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+⚠️ Please be sure that you have read pull request rules.
+
+Tick the checkbox if you understand [x]:
+- [ ] I have read and understand the pull request rules.
+
+# Description
+
+Fixes #(issue)
+
+## Type of change
+
+Please delete any options that are not relevant.
+
+- Bug fix (non-breaking change which fixes an issue)
+- User interface (UI)
+- New feature (non-breaking change which adds functionality)
+- Breaking change (a fix or feature that would cause existing functionality to not work as expected)
+- Other
+- This change requires a documentation update
+
+## Checklist
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code and tested it
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] My changes generates no new warnings
+- [ ] My code needed automated testing. I have added them (this is optional task)
+
+## Screenshots (if any)
+
+Please do not use any external image service. Instead, just paste in or drag and drop the image here, and it will be uploaded automatically.