Add Patchwork, decentralized social media app built on the SSB protocol.

README.md

@@ -411,6 +411,7 @@ _[IPBX](https://en.wikipedia.org/wiki/IP_PBX) telephony software_
 - [NodeBB](https://nodebb.org/) - Node.js based forum software built for the modern web. ([Source Code](https://github.com/NodeBB/NodeBB)) `GPL-3.0` `Nodejs`
 - [OSSN](https://www.opensource-socialnetwork.org/) - Open Source Social Network (OSSN) is a social networking software written in PHP. It allows you to make a social networking website and helps your members build social relationships, with people who share similar professional or personal interests. ([Source Code](https://github.com/opensource-socialnetwork/opensource-socialnetwork)) `GPL-2.0` `PHP`
 - [Oxwall](http://www.oxwall.org/) - Oxwall is used for a wide range of projects starting from family sites and custom social networks to collaboration tools and enterprise community solutions. ([Source Code](https://bitbucket.org/oxwall/public)) `CPAL-1.0` `PHP`
+- [Patchwork](https://github.com/ssbc/patchwork) - Decentralized messaging and sharing app built on top of Secure Scuttlebutt (SSB). `AGPL-3.0-only` `JavaScript`
 - [phpBB](https://www.phpbb.com/) - Flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can power your entire website. ([Source Code](https://github.com/phpbb/phpbb)) `GPL-2.0` `PHP`
 - [PPnet](https://github.com/pixelpark/ppnet) - Create and host your own social network. `MIT` `Javascript`
 - [Pump.io](http://pump.io/) - Stream server that does most of what people really want from a social network. ([Source Code](https://github.com/e14n/pump.io)) `Apache-2.0` `Nodejs`