Create PULL_REQUEST_TEMPLATE.md

Author: osmontero

.github/PULL_REQUEST_TEMPLATE.md

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+# **PLEASE READ BEFORE CONTINUING**
+
+To help us understand your contribution, please include the following in your pull request:
+
+* A detailed explanation of the changes you've made.
+* The reasoning behind these changes.
+* A reference to the issue that this pull request addresses.