awaitable examples.

Closes #2104.

example/websocket/client/awaitable/CMakeLists.txt

@@ -0,0 +1,23 @@
+#
+# Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
+#
+# Distributed under the Boost Software License, Version 1.0. (See accompanying
+# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+#
+# Official repository: https://github.com/boostorg/beast
+#
+
+GroupSources(include/boost/beast beast)
+GroupSources(example/websocket/client/awaitable "/")
+
+add_executable (websocket-client-awaitable
+    ${BOOST_BEAST_FILES}
+    Jamfile
+        websocket_client_awaitable.cpp
+)
+
+target_link_libraries(websocket-client-awaitable
+    lib-asio
+    lib-beast)
+
+set_property(TARGET websocket-client-awaitable PROPERTY FOLDER "example-websocket-client")