Websocket initial implementation (#9)

* Added listener and session classes.

* Added client session class.

* Fixed minor code issues.

* Initial server implementation p2p connection

* Added a seperate thread to run the two servers

* Implemented basic web socket architecture

* Implemented basic peer to peer socket network

* Added a sample message

* Initial socket architecture completed

* Improved code readability

* Improved comments

src/sock/socket_server.h

@@ -0,0 +1,37 @@
+#ifndef _SOCK_SERVER_LISTENER_H_
+#define _SOCK_SERVER_LISTENER_H_
+
+#include <boost/asio.hpp>
+#include "socket_session_handler.h"
+
+namespace net = boost::asio; // namespace asio
+
+using tcp = net::ip::tcp;
+using error = boost::system::error_code; // from <boost/system/error_code.hpp>
+
+namespace sock
+{
+
+/** 
+ * Represents an active WebSocket server connection
+ * Based on the implementation from https://github.com/vinniefalco/CppCon2018
+*/
+class socket_server : public std::enable_shared_from_this<socket_server>
+{
+    tcp::acceptor acceptor_;
+    tcp::socket socket_;
+    socket_session_handler &sess_handler_;
+
+    void fail(error ec, char const *what);
+
+    void on_accept(error ec);
+
+public:
+    socket_server(net::io_context &ioc, tcp::endpoint endpoint, socket_session_handler &session_handler);
+
+    // Start accepting incoming connections
+    void run();
+};
+} // namespace sock
+
+#endif