Add a basic github issue template

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,28 @@
+---
+name: Issue/Bug report
+about: Report an issue with or bug in `cardano-db-sync`
+title: ""
+labels: bug
+assignees: ''
+
+---
+
+**OS**
+Your OS:
+
+**Versions**
+The `db-sync` version (eg `cardano-db-sync --version`):
+PostgreSQL version:
+
+**Build/Install Method**
+The method you use to build or install `cardano-db-sync`:
+
+**Run method**
+The method you used to run `cardano-db-sync` (eg Nix/Docker/systemd/none):
+
+**Additional context**
+Add any other context about the problem here.
+
+**Problem Report**
+Please do not include screenshots or images, but instead cut and paste any relevant log messages
+or errors.