Add issue template

Author: wpolicarpo

.github/issue_template.md

@@ -0,0 +1,23 @@
+## Issue
+<!-- Give a brief summary of the issue. -->
+
+## Expected behavior
+<!-- Tell us what should happen -->
+
+## Actual behavior
+<!-- Tell us what happens instead -->
+
+## How to reproduce
+<!-- See https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/wiki/How-to-report-a-bug -->
+
+# Details
+
+- **Rails version**: `x.x.x`
+- **SQL Server adapter version**: `x.x.x`
+- **TinyTDS version**: `x.x.x`
+- **FreeTDS details**:
+
+  ```
+  run `tsql -C` and paste here the output.
+  ```
+