Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+### Description
+
+Please provide a succinct description of your issue.
+
+### Repro steps
+
+Please provide the steps required to reproduce the problem
+
+1. Step A
+
+2. Step B
+
+### Expected behavior
+
+Please provide a description of the behavior you expect.
+
+### Actual behavior
+
+Please provide a description of the actual behavior you observe. 
+
+### Known workarounds
+
+Please provide a description of any known workarounds.
+
+### Related information 
+
+* Operating system
+* Branch
+* .NET Runtime, CoreCLR or Mono Version
+* Performance information, links to performance testing scripts