Create PULL_REQUEST_TEMPLATE.md

Author: troosan

docs/PULL_REQUEST_TEMPLATE.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.
+
+Fixes # (issue)
+
+# Checklist:
+
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have run phpunit, phpcs, php-cs-fixer, phpmd
+- [ ] The new code is covered by unit tests
+- [ ] I have update the documentation to describe the changes