xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
..
detail	4d99525703 first commit	6 月之前
arithmetic.hpp	4d99525703 first commit	6 月之前
buffers.hpp	4d99525703 first commit	6 月之前
conversion.hpp	4d99525703 first commit	6 月之前
endian.hpp	4d99525703 first commit	6 月之前