update proxy-set command manual to contain information about setting up npm and gradle proxies (#3004)
update proxy-set command manual to contain information about setting up npm and gradle proxies (#3004)


NathanaelA/nativescript-cli,NathanaelA/nativescript-cli,NativeScript/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli,NativeScript/nativescript-cli,NativeScript/nativescript-cli,NathanaelA/nativescript-cli