Create feature-proposal.md

.github/PULL_REQUEST_TEMPLATE/feature-proposal.md

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+---
+name: Feature Proposal
+about: Propose code for a new feature of Kyoo
+title: "[FEATURE] "
+labels: enhancement
+---
+
+## Proposed changes
+
+Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request.
+If it fixes a bug or resolves a feature request, be sure to link to that issue.
+
+## Informations
+ - [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+ - [ ] New public API added
+ - [ ] Non-breaking changes
+
+## Checklist
+
+ - [ ] I have added tests that prove my fix is effective or that my feature works
+ - [ ] I have added necessary documentation (if appropriate)
+
+## Further comments
+
+If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did 
+and what alternatives you considered, etc...
+