docs/services/usage: added further instructions (link to gopkgdoc)
docs/services/usage: added further instructions (link to gopkgdoc)

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