xhj/embeded-gateway: 网关代码

xhj 4d99525703 first commit		6 月之前
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angle	4d99525703 first commit	6 月之前
astronomical	4d99525703 first commit	6 月之前
cgs	4d99525703 first commit	6 月之前
imperial	4d99525703 first commit	6 月之前
information	4d99525703 first commit	6 月之前
metric	4d99525703 first commit	6 月之前
si	4d99525703 first commit	6 月之前
temperature	4d99525703 first commit	6 月之前
us	4d99525703 first commit	6 月之前