Collect some features for the README

README.md

@@ -4,7 +4,25 @@
 
 ## Overview
 
-Technologies: 
+### Features
+
+- **Automatic schedule import** for re:publica, Pretalx/Hub
+- **Integrations** with [C3Lingo Filedrop](https://github.com/c3lingo/c3t-drop), [Engelsystem](https://github.com/engelsystem/engelsystem) and more
+- **Collaborate live** on session changes using websockets
+- **One-click assignment** of angels
+- **Express interest** (with optional note) for sessions
+- **Stay on top of assignments** with *My Assignments* view and personalized calendar (.ics) feeds
+- **Add globally visible notes to sessions**
+- **Multiple conferences** supported
+- **Conflict detection** even across conferences
+- **Self-service account creation** with optional invite-token
+- **Manage source and target languages** per angel and per session
+- **Dark mode** and (mostly) responsive web app
+- **Statistics and leaderboards**
+- ... and more 🎁
+
+### Technologies:
+
 - [Ruby on Rails](https://rubyonrails.org/) with [SQLite](https://sqlite.org/) DB
 - [Tailwind CSS](https://tailwindcss.com/)
 - [Turbo](https://turbo.hotwired.dev/) + [Stimulus](https://stimulus.hotwired.dev/)