[docs] added PR template

.github/pull_request_template.md

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+# Pull Request
+
+[] Closes #
+[] Added tests (if necessary)
+[] Run tests
+[] Run formatting
+[] Commented the code
+
+## Changes description
+
+Describe what your changes will do and any TODOs there might be in the future related to the issue you are closing.
+
+## Current output
+
+Give evidence like screenshots of what your job looks like.
+
+## Time spent breakdown
+
+Give a breakdown on the time you used to solve the issue you are closing.
+
+## Comments
+
+Any other details you might want to share.