Add issue template.

.github/ISSUE_TEMPLATE.md

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+<!-- 
+
+Thank you for taking the time to report an ODK Collect issue!
+
+This space is for submitting problems and feature requests. For general usage questions, please email [email protected] or for development questions, please email [email protected]
+
+Please visit https://github.com/opendatakit/collect/issues?utf8=%E2%9C%93&q=is%3Aissue and search to see whether your issue was already reported or fixed. If you find a match, comment on it or add a +1 rather than posting a new issue. If you find a problem you know how to fix, submit a pull request. 🎉
+
+For all problem reports, please use the template below. Also include any relevant stack traces or error messages.
+
+For feature requests you may delete the template.
+
+-->
+
+### Software and hardware versions (ODK Collect, Android Studio, Android, device used...)
+
+### Expected behavior
+
+### Actual behavior
+
+### Steps to reproduce the bad behavior
+
+### Other information (things you tried, stack traces, related issues, suggestions on how to fix it...)