Merge pull request #13898 from Ultimaker/ad_pr_template

Add PR template

docs/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)
+- [ ] Setting 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:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have uploaded any files required to test this change