Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+### This pull request...
+  - [ ] Fixes a bug
+  - [ ] Introduces a new feature
+  - [ ] Improves an existing feature
+  - [ ] Boosts code quality or performance
+
+### Description
+Replace this with a description of the pull request
+
+### Purpose
+Replace this with a description of the problem or use-case
+
+### Relevant Issue(s)
+This PR closes issue #...