cmd/tsuru/developer: add docs for add-unit
cmd/tsuru/developer: add docs for add-unit

cezarsa/tsuru,tuxmonteiro/tsuru,4eek/tsuru,gciotta/tsuru,guilhermebr/tsuru,mderaldo/tsuru,tsuru/tsuru,ggarnier/tsuru,RichardKnop/tsuru,Endika/tsuru,tsuru/tsuru,hcxiong/tsuru,Endika/tsuru,ArxdSilva/tsuru,tsuru/tsuru,kgrvamsi/tsuru,hugoantunes/tsuru,cgvarela/tsuru,gwmoura/tsuru,mderaldo/tsuru,cezarsa/tsuru,ggarnier/tsuru,kgrvamsi/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,guilhermebr/tsuru,kgrvamsi/tsuru,jblancett/tsuru,4eek/tsuru,guilhermebr/tsuru,tsuru/tsuru,cezarsa/tsuru,jblancett/tsuru,ArxdSilva/tsuru,hcxiong/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,cgvarela/tsuru,ggarnier/tsuru,ggarnier/tsuru,tuxmonteiro/tsuru,tuxmonteiro/tsuru,cgvarela/tsuru,mderaldo/tsuru,RichardKnop/tsuru,RichardKnop/tsuru,hugoantunes/tsuru,firebitsbr/tsuru,firebitsbr/tsuru,4eek/tsuru,gciotta/tsuru,gciotta/tsuru,firebitsbr/tsuru,jblancett/tsuru,Endika/tsuru,hcxiong/tsuru,cezarsa/tsuru