Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+## Thank you for sending in a pull request, here's some tips to get started!
+
+(Please delete all these tips and replace with your text)
+
+- Mention "#(issue)" in the description, when applicable
+- Please do not check in files that don't have real changes
+- Please do not reformat lines that you didn't have to change the code on
+- If your other co-developers have comments on your PR please tweak as needed
+- Do not use any external image service, just paste or drag and drop the image here and it will be uploaded automatically