Add talkyard

Add talkyard to the Social Networks and Forums section.

README.md

@@ -423,6 +423,7 @@ _[IPBX](https://en.wikipedia.org/wiki/IP_PBX) telephony software_
 - [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`
 - [Socialhome](https://socialhome.network) - Federated and decentralized profile builder and social network engine. ([Demo](https://socialhome.network/public/), [Source Code](https://github.com/jaywink/socialhome)) `AGPL-3.0` `Python`
 - [Symphony](https://hacpai.com/) - Modern community (forum/SNS/blog) platform written in Java. ([Source Code](https://github.com/b3log/symphony)) `GPL-3.0` `Java`
+- [Talkyard](https://www.talkyard.io/) - Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat (Slack/StackOverflow/Discourse/Reddit/Disqus hybrid). ([Demo](https://www.talkyard.io/forum/latest), [Source Code](https://github.com/debiki/talkyard)) `AGPL-3.0` `Scala`
 - [Telescope](http://www.telescopeapp.org/) - Open-source social news app built with Meteor. ([Demo](http://demo.telescopeapp.org/), [Source Code](https://github.com/TelescopeJS/Telescope)) `MIT` `Nodejs`
 - [Tokumei](https://tokumei.co/) - Anonymous microblogging platform. ([Demo](https://demo.tokumei.co/), [Source Code](https://kfarwell.org/projects/tokumei/git/)) `ISC` `rc`
 - [twister](http://twister.net.co/) - Fully decentralized P2P microblogging platform leveraging the free software implementations of Bitcoin and BitTorrent protocols. ([Source Code](https://github.com/miguelfreitas/twister-core)) `MIT` `C++`