Add usage question template

.github/ISSUE_TEMPLATE/usage_question.md

@@ -0,0 +1,15 @@
+---
+name: Usage question
+about: How do I use the library and API?
+title: ''
+labels: ''
+assignees:
+
+---
+
+# Note
+This issue tracker is for **bug reports**. Please don't ask about how to use the library here – the docs are comprehensive and include examples: https://pyzotero.readthedocs.io.
+
+You can also ask questions on the forum: https://forums.zotero.org/discussions
+
+A guide to the Zotero API itself is here: https://www.zotero.org/support/dev/web_api/v3/start