xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
detail	4d99525703 first commit	6 月之前
async.hpp	4d99525703 first commit	6 月之前
future.hpp	4d99525703 first commit	6 月之前
future_status.hpp	4d99525703 first commit	6 月之前
packaged_task.hpp	4d99525703 first commit	6 月之前
promise.hpp	4d99525703 first commit	6 月之前