Create PULL_REQUEST_TEMPLATE.md

Author: driesvints

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Please only send a pull request to branches which are currently supported: https://laravel.com/docs/releases#support-policy
+
+If you are unsure which branch your pull request should be sent to, please read: https://laravel.com/docs/contributions#which-branch
+
+Pull requests without a descriptive title, thorough description, or tests will be closed.
+
+In addition, please describe the benefit to end users; the reasons it does not break any existing features; how it makes building web applications easier, etc.
+-->