docs: add community session implementations section (#2139)

Co-authored-by: Kazuhiro Sera <[email protected]>

Author: knowsuchagency

docs/sessions/index.md

@@ -427,6 +427,16 @@ result = await Runner.run(
 )
 ```
 
+## Community session implementations
+
+The community has developed additional session implementations:
+
+| Package | Description |
+|---------|-------------|
+| [openai-django-sessions](https://pypi.org/project/openai-django-sessions/) | Django ORM-based sessions for any Django-supported database (PostgreSQL, MySQL, SQLite, and more) |
+
+If you've built a session implementation, please feel free to submit a documentation PR to add it here!
+
 ## API Reference
 
 For detailed API documentation, see: