doc: add install command usage
doc: add install command usage

bronson/apm,ethanp/apm,bcoe/apm,fscherwi/apm,Nikpolik/apm,atom/apm,bcoe/apm,pusateri/apm,ethanp/apm,VandeurenGlenn/apm,jlord/apm,fscherwi/apm,atom/apm,jlord/apm,AtaraxiaEta/apm,pusateri/apm,bcoe/apm,pusateri/apm,jlord/apm,jlord/apm,VandeurenGlenn/apm,atom/apm,jlord/apm,VandeurenGlenn/apm,ethanp/apm,AtaraxiaEta/apm,pusateri/apm,pusateri/apm,bcoe/apm,VandeurenGlenn/apm,ethanp/apm,gutsy/apm,AtaraxiaEta/apm,AtaraxiaEta/apm,bronson/apm,gutsy/apm,Nikpolik/apm,gutsy/apm,VandeurenGlenn/apm,bcoe/apm,ethanp/apm,fscherwi/apm,pusateri/apm,fscherwi/apm,fscherwi/apm,ethanp/apm,AtaraxiaEta/apm,Nikpolik/apm,jlord/apm,fscherwi/apm,AtaraxiaEta/apm,bcoe/apm,Nikpolik/apm,gutsy/apm,atom/apm,bronson/apm,VandeurenGlenn/apm,bronson/apm