Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## What is the new behavior?
+_This section describes what this PR is about. It should be a clear and concise description concerning what this PR is for, why this PR is needed, and why it should be accepted._
+_Linking an issue can be used alternatively to writing a description._
+
+## Implementation Details
+_Any implementations in this PR that should be carefully looked over, or that could/should have alternate solutions proposed._
+
+## Outcome
+_A short description of what this PR added/fixed/changed/removed._
+_For correct linking of issues please use any of the Closes/Fixes/Resolves keywords. Example: When a PR is fixing a bug use "Fixes: #number-of-bug"_
+
+## Additional Information
+_This section is for screenshots to demonstrate any GUI or rendering changes, or any other additional information that reviewers should be aware of._
+
+## Potential Compatibility Issues
+_This section is for defining possible compatibility issues._
+
+**Please fill in as much useful information as possible. Also, please remove all unused sections, including this and the other explanations.**