add django app overview readme

backend/README.md

@@ -1,14 +1,86 @@
 # Django Setup
 
 ## Apps
+The backend is split up into the following apps.
+
+### config
+Root Django App. Doesn't define any views.
+
+- Has main `settings.py`
+- Has main `urls.py` responsible for routing to other apps
+
+### common
+Functionality shared between apps.
+
+Defines views on the root `/api/*` path. Has base views to inherit from.
+
+- Connections to ES and Redis
+- Searching
+- URL parser
+- Collection of helper functions
 
 ### appsettings
+Responsible for functionality from the settings pages.
+
+Defines views at `/api/appsettings/*`.
+
+- Index setup
+- Reindexing
+- Snapshots
+- Filesystem Scan
+- Manual import
+
 ### channel
-### common
-### config
+Responsible for Channel Indexing functionality.
+
+Defines views at `/api/channel/*` path.
+
 ### download
+Implements download functionality with yt-dlp.
+
+Defines views at `/api/download/*`.
+
+- Download videos
+- Queue management
+- Thumbnails
+- Subscriptions
+
 ### playlist
+Implements playlist functionality.
+
+Defines views at `/api/playlist/*`.
+
+- Index Playlists
+- Manual Playlists
+
 ### stats
+Builds aggregations views for the statistics dashboard.
+
+Defines views at `/api/stats/*`.
+
 ### task
+Defines tasks for Celery. 
+
+Defines views at `/api/task/*`.
+
+- Has main `tasks.py` with all shared_task definitions
+- Has `CustomPeriodicTask` model
+- Implements apprise notifications links
+- Implements schedule functionality
+
 ### user
+Implements user and auth functionality.
+
+Defines views at `/api/config/*`.
+
+- Defines custom `Account` model
+
 ### video
+Index functionality for videos.
+
+Defines views at `/api/video/*`.
+
+- Index videos
+- Index comments
+- Index/download subtitles
+- Media stream parsing