Create PULL_REQUEST_TEMPLATE.md

Author: ktaranov

.github/PULL_REQUEST_TEMPLATE.md

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+Fixes # .
+
+Changes proposed in this pull request:
+ - 
+ - 
+ - 
+
+How to test this code:
+ - 
+ - 
+ - 
+
+Has been tested on (remove any that don't apply):
+ - Powershell 3 and above
+ - Windows 7 and above