Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+Before filing an issue, search for solutions here:
+- USRP users mailing list (http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com)
+- https://kb.ettus.com/Knowledge_Base
+- https://files.ettus.com/manual/
+
+## Issue Description ##
+[Describe the issue in detail]
+
+## Setup Details ##
+[Specify details of the test setup. This would help us reproduce the problem reliably]
+e.g. UHD/FPGA Version/Git Hash, Operation System, Hardware
+
+## Expected Behavior ##
+[What you expect to happen]
+
+## Actual Behaviour ##
+[What happens instead e.g. error message]
+
+## Steps to reproduce the problem ##
+[Tell us how to reproduce this issue
+e.g. command lines, GNU Radio flow graph screenshot and .grc etc]
+
+## Additional Information ##
+[Any additional information, configuration or data that might be necessary to reproduce the issue]