Add info about `kops create ig` command in docs
Add info about `kops create ig` command in docs

aledbf/kops,kubernetes/kops,andrewsykim/kops,gambol99/kops,robinpercy/kops,justinsb/kops,tsupertramp/kops,chrislovecnm/kops,justinsb/kops,tsupertramp/kops,chrislovecnm/kops,kubernetes/kops,blakebarnett/kops,gambol99/kops,gambol99/kops,andrewsykim/kops,robinpercy/kops,mad01/kops,blakebarnett/kops,mad01/kops,blakebarnett/kops,justinsb/kops,robinpercy/kops,aledbf/kops,andrewsykim/kops,gambol99/kops,aledbf/kops,chrislovecnm/kops,aledbf/kops,robinpercy/kops,kubernetes/kops,tsupertramp/kops,chrislovecnm/kops,tsupertramp/kops,andrewsykim/kops,blakebarnett/kops,mad01/kops,mad01/kops