docs: added readme with todo list

README.md

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+# Otter
+
+## Todo list
+
+The (initial) goal here is only to support JSON. Other formats *might* be added
+on later, no guarantees.
+
+* Authentication API
+    - [ ] Login / Verify Login
+    - [ ] 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
+    - [ ] 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