Create PULL_REQUEST_TEMPLATE.md

Author: mrchief

PULL_REQUEST_TEMPLATE.md

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+## What does it do?
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+## Fixes # (issue)
+
+Please mention in the format "Fixes #issueNumber" or "Closes #issueNumber". 
+This is important for semantic-release to correctly generate release tags and update issues.
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] 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
+
+# Checklist:
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] Updated documentation (if applicable)
+- [ ] Added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] My changes generate no new warnings
+- [ ] Added myself to contributors table
+- [ ] I have updated `docs/bundle.js` file (ran `yarn build:docs` and checked in the new `bundle.js` file)