Add issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,27 @@
+### Before submitting
+
+This repo is for Npgsql ADO.NET issues only. Entity Framework issues belong in Npgsql.EntityFrameworkCore.PostgreSQL for EF Core, or EntityFramework6.Npgsql for EF 6.x.
+
+### Steps to reproduce
+
+Ideally include a complete code listing that we can run to reproduce the issue.
+Alternatively, you can provide a project/solution that we can run.
+
+### The issue
+Describe what is not working as expected.
+
+If you are seeing an exception, include the full exceptions details (message and stack trace).
+
+```
+Exception message:
+Stack trace:
+```
+
+### Further technical details
+
+Npgsql version:
+PostgreSQL version:
+Operating system: 
+
+Other details about my project setup:
+