Create ISSUE_TEMPLATE.md

Author: lbargaoanu

ISSUE_TEMPLATE.md

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+<!-- 
+
+   If you're new to AutoMapper, please ask a question on StackOverflow first and come back here if the people there consider it a bug.
+   If you've just upgraded to 9.0, please read the upgrade guide first (https://docs.automapper.org/en/latest/9.0-Upgrade-Guide.html).
+   Try to provide [a minimal, complete, and verifiable example](https://stackoverflow.com/help/mcve), preferably a [gist](https://gist.github.com/lbargaoanu/9c7233441c3a3413cc2b9b9ebb5964a9) that we can execute and see fail. [Here](https://gist.github.com/lbargaoanu/0cbc531306223f7ffc5468becf2642d6) is an example for ProjectTo.
+   For feature requests, just clear out the below.
+-->
+
+### Source/destination types
+
+```csharp
+// Put your source/destination types here
+```
+
+### Mapping configuration
+
+```csharp
+// Mapper.Initialize or just the CreateMap snippet 
+```
+
+### Version: x.y.z
+<!-- 
+    Include the major/minor version (4.2.1, 5.2.0, 6.0.2 etc) 
+    If you're using ProjectTo, also specify the EF Core or EF6 version.
+--> 
+
+### Expected behavior
+
+<!-- What did you expect to happen? Or what used to happen in an older version? -->
+
+### Actual behavior
+
+<!-- What happened instead? -->
+
+### Steps to reproduce
+
+```csharp
+// Your calls to Mapper.Map or ProjectTo here, with source/destination objects constructed
+```