Create ISSUE_TEMPLATE.md

Added an issue template.. as per the other f# projects

Author: colinbull

ISSUE_TEMPLATE.md

@@ -0,0 +1,32 @@
+
+### 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 behaviour you expect.
+
+### Actual behavior
+
+Please provide a description of the actual behaviour you observe. 
+
+### Known workarounds
+
+Please provide a description of any known workarounds.
+
+### Related information 
+
+* Operating system
+* Branch
+* Emacs version
+* .NET Runtime, CoreCLR or Mono Version
+* Performance information, links to performance testing scripts