Add issue template.

.github/ISSUE_TEMPLATE.md

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+If you're having a generation problem please answer these questions before submitting your issue. Thanks!
+
+### What version of SQLBoiler are you using (`sqlboiler --version`)?
+
+
+### If this happened at generation time what was the full SQLBoiler command you used to generate your models? (if not applicable leave blank)
+
+
+### If this happened at runtime what code produced the issue? (if not applicable leave blank)
+
+
+### What is the output of the command above with the `-d` flag added to it? (Provided you are comfortable sharing this, it contains a blueprint of your schema)
+
+
+### Please provide a relevant database schema so we can replicate your issue (Provided you are comfortable sharing this)
+
+
+### Further information. What did you do, what did you expect?