Create PULL_REQUEST_TEMPLATE.md

This will act as a template for GitHub Pull Requests.
GitHub allows to hide this file in `.github` folder, so I did.

diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
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+## Purpose
+
+_Do a quick recap of your work here._
+
+JIRA issue: [CORE-XXXX](https://jira.reactos.org/browse/CORE-XXXX)
+
+## Proposed changes
+- 
+- 
+
+## TODO
+- [ ] Task 1
+- [ ] Task 2