Add CppCon2018 chat server example and video

example/cppcon2018/README.md

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+*This repository contains the presentation file and compiling
+source code for the CppCon2018 talk.*
+
+# Get Rich Quick! Using Boost.Beast WebSockets and Networking TS
+
+Do you want to make a lot of money? You'll see some examples of free
+browser and server based WebSocket programs which have earned their
+respective individual authors tens of millions of dollars in no time
+at all. Perhaps after seeing this talk in person, you'll write the
+next massively successful WebSocket app!
+
+The WebSocket protocol powers the interactive web by enabling two-way
+messaging between the browser and the web server. The Boost.Beast
+library implements this protocol on top of the industry standard
+Boost.Asio library which models the Networking Technical Specification
+proposed for the ISO C++ Standard.
+
+This presentation introduces Networking TS concepts and algorithms,
+how to read their requirements, and how to use them in your programs.
+We will build from scratch a multi-user chat server in C++11 using
+Beast, and the corresponding browser-based chat client in HTML and
+JavaScript. No prior knowledge or understanding of Beast or Asio is
+required, the talk is suited for everyone.