Also available on http://www.missiaen.com.
I also highly recommend attending the level 400 Lync Ignite Session A Technical Deep Dive into Building Web Apps with the Skype Web SDK by David Newman (Program Manager) and Srividhya Chandrasekaran (Senior Program Manager). This session leads you into the development of web applications with the new Skype Developer Platform for Web. Learn how to build new web experiences that seamlessly integrate a wide variety of real-time collaboration models leveraging Skype for Business services and the larger Skype network. Build comprehensive web apps with audio, video, sharing, presence, instant messaging and more. Learn how to integrate communications experiences within the context of your applications and create new Consumer interactions from the web.
Also recommended is the session The Skype Developer Platform and Skype Web Developer Capabilities on //build/ event where Andrew Bybee, Srividhya Chandrasekaran, Dan Gardiner and Daniel Valik highlight this SDK.
I also recommend the Skype for Business Developer Platform Update session of Build 2016:
Another session on Build2016 illustrating Skype Web SDK below: