Flesh out README

README.md

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 # Ditto
 
+Ditto is a tiny but powerful social media server for the decentralized web. With Ditto you will be able to interact across protocols and networks, and build your own social media experience.
+
+<img width="400" src="ditto-planet.png">
+
 ⚠️ This software is a work in progress.
 
-<img width="400" src="ditto-planet.png">
+## Supported protocols
+
+- [x] Nostr
+- [ ] ActivityPub
+
+## Features
+
+- [ ] Follow users across networks
+- [ ] Post to multiple networks at once
+- [x] Log in with any Mastodon app
+- [x] Like and comment on posts
+- [x] Share posts
+- [ ] Reposts
+- [ ] Notifications
+- [x] Profiles
+- [ ] Search
+- [ ] Moderation
+- [x] Customizable
+- [x] Open source
+- [x] Self-hosted
+- [x] Decentralized
+- [x] No ads
+- [x] No tracking
+- [x] No censorship
+
+## Federation
+
+Ditto is primarily a Nostr client, using a Nostr relay as its database. ActivityPub objects are translated into Nostr events in realtime and cached by the Ditto server. When you submit a post, it sends it to your Nostr relay and then fans it out to the ActivityPub network.
+
+The main way to use Ditto is with a Mastodon app. Or you can connect directly to the Nostr relay with a Nostr client.
+
+## Installation
+
+TODO
+
+## Development
+
+1. Install [Deno](https://deno.land).
+2. Clone this repo.
+3. Run `deno task dev`
+
+## License
+
+© Alex Gleason & other Ditto contributors  
+
+Ditto is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Ditto is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with Ditto. If not, see <https://www.gnu.org/licenses/>.