Add issue template

Author: jonsharratt

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,28 @@
+# This is a (Bug Report / Feature Proposal)
+<!--
+Reminder to label this with bug or feature
+-->
+
+## Description
+
+For bug reports:
+* What went wrong?
+* What did you expect should have happened?
+* What was the config / env variables you used?
+* What stacktrace or error message did you
+experience?
+
+For feature proposals:
+* What is the use case that should be solved. The
+more detail you describe this in the easier it is
+to understand for us.
+* If there is additional config how would it look
+
+Similar or dependent issues:
+* #12345
+
+## Additional Data
+
+* ***NPM CLI version you are using***:
+* ***Serverless version you're using***:
+* ***Node version you're using***: