Add websocket-server-async example

example/websocket-server-async/CMakeLists.txt

@@ -0,0 +1,13 @@
+# Part of Beast
+
+GroupSources(include/beast beast)
+GroupSources(example/websocket-server-async "/")
+
+add_executable (websocket-server-async
+    ${BEAST_INCLUDES}
+    websocket_server_async.cpp
+)
+
+target_link_libraries(websocket-server-async
+    Beast
+    )