Add pull request template

.github/pull_request_template.md

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+## Pull request checklist
+
+Please check if your PR fulfills the following requirements:
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been reviewed and added / updated if needed (for bug fixes / features)
+- [ ] Tests (`bundle exec rake`) have passed locally
+- [ ] Lint (`bundle exec rubocop`) has passed locally and any fixes were made for failures
+
+
+## Pull request type
+
+<!-- Please do not submit updates to dependencies unless it fixes an issue. --> 
+
+<!-- Please try to limit your pull request to one type, submit multiple pull requests if needed. --> 
+
+Please check the type of change your PR introduces:
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update (formatting, renaming)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Build related changes
+- [ ] Documentation content changes
+- [ ] Other (please describe): 
+
+## Breaking Changes
+<!-- Does anything in this PR effect the existing user facing API? -->
+
+Does This introduce a breaking change?
+- [ ] Yes
+- [ ] No
+
+<!-- List the cumulative changes here in an itemized list -->
+## Added
+
+## Removed
+
+## Changed
+
+## Fixed