Create README.md

Author: akzi

README.md

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+# xwebsocket
+c++11 websocket parser builder. small ,simple and fast
+```
+  int main()
+  {
+    std::map<int64_t, xwebsocket::session> sessions_;
+		int64_t session_id_ = 0;
+		int64_t msg_count_ = 0;
+		xwebsocket::xserver server(1);
+		server.bind("127.0.0.1", 9001).
+			regist_accept_callback([&](xwebsocket::session &&sess) {
+
+				sess.regist_frame_callback([session_id_, &sessions_, &msg_count_]
+				(std::string &&payload, xwebsocket::frame_type type, bool){
+
+					if (type == xwebsocket::frame_type::e_connection_close)
+						return sessions_[session_id_].close();
+					++msg_count_;
+					std::cout << payload << std::endl;
+					sessions_[session_id_].send_text("hello world: " + std::to_string(msg_count_));
+				});
+				sess.regist_close_callback([session_id_, &sessions_] {
+					sessions_.erase(session_id_);
+				});
+			sessions_.emplace(session_id_, std::move(sess));
+			session_id_++;
+		});
+
+		server.start();
+    return 0;
+    }
+```