Add GitHub issue templates

Add templates to point users towards the community support channels.

Signed-off-by: Ben Kochie <superq@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,47 @@
+---
+name: Bug report
+about: Create a report to help us improve.
+title: ''
+assignees: ''
+---
+
+<!--
+
+    Please do *NOT* ask usage questions in Github issues.
+
+    If your issue is not a feature request or bug report use our community support.
+
+    https://prometheus.io/community/
+
+-->
+
+**What did you do?**
+
+**What did you expect to see?**
+
+**What did you see instead? Under which circumstances?**
+
+**Environment**
+
+* System information:
+
+	insert output of `uname -srm` here
+
+* postgres_exporter version:
+
+	insert output of `postgres_exporter --version` here
+
+* postgres_exporter flags:
+
+```
+insert list of flags used here
+```
+
+* PostgresSQL version:
+
+	insert PostgreSQL version here
+
+* Logs:
+```
+insert logs relevant to the issue here
+```