Create ISSUE_TEMPLATE.md

Author: alexellis

.github/ISSUE_TEMPLATE.md

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+<!-- Due dilligence -->
+
+## My actions before raising this issue
+- [ ] Followed the [troubleshooting guide](https://docs.openfaas.com/deployment/troubleshooting/)
+- [ ] Read/searched [the docs](https://docs.openfaas.com/)
+- [ ] Searched [past issues](/issues)
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+
+## Expected Behaviour
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+
+## Current Behaviour
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->
+
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+1.
+2.
+3.
+4.
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* FaaS-CLI version ( Full output from: `faas-cli version` ):
+
+* Docker version `docker version` (e.g. Docker 17.0.05 ):
+
+* Are you using Docker Swarm or Kubernetes (FaaS-netes)?
+
+* Operating System and version (e.g. Linux, Windows, MacOS):
+
+* Code example or link to GitHub repo or gist to reproduce problem:
+
+* Other diagnostic information / logs from [troubleshooting guide](https://docs.openfaas.com/deployment/troubleshooting)
+
+## Next steps
+
+You may [join Slack](https://docs.openfaas.com/community) for community support.