Create ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

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+### Description
+
+[Description of the issue]
+
+### Complete minimal example reproducing the issue
+
+Complete means the code snippet can be copied into a unit test method in a fresh C# project and run.
+Minimal means it is stripped from code not related to reproducing the issue.
+
+E.g.
+
+```csharp
+// Arrange
+string input = "MyString";
+
+// Act
+char result = input[0];
+
+// Assert
+result.Should().Be('M');
+```
+
+### Expected behavior:
+
+[What you expect to happen]
+
+### Actual behavior:
+
+[What actually happens]
+
+### Versions
+
+* Which version of Fluent Assertions Analyzers are you using?
+* Which .NET runtime and version are you targeting? E.g. .NET framework 4.6.1 or .NET Core 2.0.
+
+### Additional Information
+
+Any additional information, configuration or data that might be necessary to reproduce the issue.