Create PULL_REQUEST_TEMPLATE.md

Author: auanasgheps

PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Please open this PR against the `dev` branch. **Do NOT** use the `master` branch, as I use it only for released code!
+
+Please include a summary of the changes and the related issue. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes #(issue)
+
+## Type of change
+
+(Please delete options that are not relevant.)
+
+- [ ] Bug fix or improvement (non-breaking change which fixes an issue, or improvements like code clean-up)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update (the maintainer will take care of this)
+
+## Checklist:
+
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code (only required for new or big features)
+- [ ] My changes generate no new warnings