docs: a template for support requests

.github/ISSUE_TEMPLATE/support.md

@@ -0,0 +1,26 @@
+---
+name: Support request
+about: Ask for help using coverage.py
+title: ''
+labels: support, needs triage
+assignees: ''
+
+---
+
+**Have you asked elsewhere?**
+
+There are other good places to ask for help using coverage.py. These places let
+other people suggest solutions, are more likely places for people to find your
+question:
+
+- [Stack Overflow](https://stackoverflow.com/questions/tagged/coverage.py)
+- [discuss.python.org](https://discuss.python.org/search?q=coverage.py)
+
+**Describe your situation**
+
+Wherever you ask your question, be sure to explain:
+
+- What you did
+- What happened
+- How that was different than what you wanted to happen
+- What kind of help you need