docs: updated readme and added changelog

README.md

@@ -1,49 +1,13 @@
 # Otter
 
-## Todo list
+Otter is a modern implementation of the [Gpodder server](https://gpodder.net/)
+API. Its primary goal is to be used as a self-hostable drop-in replacement for
+Gpodder, suitable for low-power devices.
 
-The (initial) goal here is only to support JSON. Other formats *might* be added
-on later, no guarantees.
+## Features
 
-* Authentication API
-    - [x] Login / Verify Login
-    - [x] Logout
-* Directory API
-    - [ ] Retrieve Top Tags
-    - [ ] Retrieve Podcasts for Tag
-    - [ ] Retrieve Podcast Data
-    - [ ] Retrieve Episode Data
-    - [ ] Podcast Toplist
-    - [ ] Podcast Search
-* Suggestions API
-    - [ ] Retrieve Suggested Podcasts
-* Device API
-    - [x] Update Device Data
-    - [-] List Devices
-    - [ ] Get Device Updates
-* Subscriptions API
-    - [ ] Get Subscriptions of Device
-    - [ ] Get All Subscriptions
-    - [ ] Upload Subscriptions of Device
-    - [ ] Upload Subscription Changes
-    - [ ] Get Subscription Changes
-* Episode Actions API
-    - [ ] Episode Action Types
-    - [ ] Upload Episode Actions
-    - [ ] Get Episode Actions
-* Podcast Lists API
-    - [ ] Create Podcast List
-    - [ ] Get User’s Lists
-    - [ ] Get a Podcast List
-    - [ ] Update a Podcast List
-    - [ ] Delete a Podcast List
-* Settings API
-    - [ ] Known Settings
-    - [ ] Save Settings
-    - [ ] Get Settings
-* Favorites API
-    - [ ] Get Favorite Episodes
-* Device Synchronization API
-    - [ ] Get Sync Status
-    - [ ] Start / Stop Sync
-- [ ] Client Parametrization
+* Implementation of API sections needed for synchronisation
+    * Authentication
+    * Devices API
+    * Subscriptions API
+    * Episode actions API