Merge pull request #6 from NuGet/dev

Create  PULL_REQUEST_TEMPLATE.md

Author: maartenba

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,6 @@
+Make sure to check the following when opening a pull request:
+
+* If it's a large contribution, please open a regular issue first and discuss with the team
+* Make sure the PR targets the `dev` branch
+
+Having that said: thank you for your contribution already!