Create ISSUE_TEMPLATE.md

Lately a lot of issues are Serilog package mismatches, or they lack enough information to reproduce the issue. Hopefully this will help...

Author: MV10

.github/ISSUE_TEMPLATE.md

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+## Bug Report / Support Request Template
+If you are opening a feature request, you can ignore this template. Bug reports and requests for assistance usually require the same basic information described below. This will help us more quickly reproduce and investigate the problem you're reporting.
+
+**Please clearly describe of what the SQL Sink is doing incorrectly:**
+
+**Please clearly describe the expected behavior:**
+
+**Name and version of all Serilog packages used in the project:**
+
+- Serilog: 
+- Serilog.Sinks.MSSqlServer: 
+- (configuration, etc.)
+
+**Target framework and operating system:**
+
+- [ ] .NET Core 2.0
+- [ ] .NET Framework 4.7
+- [ ] .NET Framework 4.6.x
+- [ ] .NET Framework 4.5.x
+- OS: 
+
+**Please provide the following as a _simple_ reproduction of the reported issue:**
+
+Serilog configuration code:
+
+Serilog configuration file, if any:
+
+Application code to reproduce the issue: