Create PULL_REQUEST_TEMPLATE.md

Author: khoadnguyen

PULL_REQUEST_TEMPLATE.md

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+**Describe the changes in this Pull Request**
+Give a general description of the changes that were made on this pull request. 
+
+**What issue(s) does this Pull Request resolve?**
+Use a list & give detail into your changes and why you made them. Utilize Github's linking feature to reference issues that were closed.
+
+Use any of these keywords followed by the issue number: _close, closes, closed, fix, fixes, fixed, resolve, resolves, resolved #[issueNumber]_
+
+1. Resolves #001
+2. Closes #002
+
+_Make sure the Pull Request is appropriately tagged!_