Add a pull request template

Author: unixorn

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Screenshots (if appropriate):
+
+## Type of changes
+<!--- What types of changes does your submission introduce? Put an `x` in all the boxes that apply: -->
+- [ ] A helper script
+- [ ] A link to an external resource like a blog post
+
+## Checklist:
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!--- If you're unsure about any of these, don't hesitate to ask. I'm happy to help! -->
+- [ ] All new and existing tests pass.
+- [ ] Any scripts added use `#!/usr/bin/env interpreter` instead of potentially platform-specific direct paths (`#!/bin/sh` is an ok exception)
+- [ ] I have confirmed that the link(s) in my PR are valid.
+- [ ] I have read the **CONTRIBUTING** document.