Moved PR template to .github

Added contribution link and code style links

.github/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+<!-- Please include a summary of which issue is fixed or feature was added. Please also include relevant motivation and context. 
+If this pull request adds settings definitions for machines/materials, list them here. 
+
+This fixes... OR This improves... -->
+
+## Type of change
+
+<!-- Please delete options that are not relevant. -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Printer definition file(s)
+- [ ] Translations
+
+# How Has This Been Tested?
+
+<!-- Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration -->
+
+- [ ] Test A
+- [ ] Test B
+
+**Test Configuration**:
+* Operating System:
+
+# Checklist:
+<!-- Check if relevant -->
+
+- [ ] My code follows the style guidelines of this project as described in [UltiMaker Meta](https://github.com/Ultimaker/Meta) and [Cura QML best practices](https://github.com/Ultimaker/Cura/wiki/QML-Best-Practices)
+- [ ] I have read the [Contribution guide](https://github.com/Ultimaker/Cura/blob/main/contributing.md) 
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have uploaded any files required to test this change