Add PR template (#52)

Author: kvch

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,54 @@
+<!-- Type of change
+Please label this PR with one of the following labels, depending on the scope of your change:
+- Bug
+- Enhancement
+- Breaking change
+- Deprecation
+- Cleanup
+- Docs
+-->
+
+## What does this PR do?
+
+<!-- Mandatory
+Explain here the changes you made on the PR. Please explain the WHAT: patterns used, algorithms implemented, design architecture, message processing, etc.
+-->
+
+## Why is it important?
+
+<!-- Mandatory
+Explain here the WHY, or the rationale/motivation for the changes.
+-->
+
+## Checklist
+
+<!-- Mandatory
+Add a checklist of things that are required to be reviewed in order to have the PR approved
+
+List here all the items you have verified BEFORE sending this PR. Please DO NOT remove any item, striking through those that do not apply. (Just in case, strikethrough uses two tildes. ~~Scratch this.~~)
+-->
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] I have added an entry in `CHANGELOG.md`
+
+## Author's Checklist
+
+<!-- Recommended
+Add a checklist of things that are required to be reviewed in order to have the PR approved
+-->
+- [ ]
+
+## Related issues
+
+<!-- Recommended
+Link related issues below. Insert the issue link or reference after the word "Closes" if merging this should automatically close it.
+
+- Closes #123
+- Relates #123
+- Requires #123
+- Superseds #123
+-->
+- 
+