oidc: remove unnecessary README
oidc: remove unnecessary README

alberts/go-oidc,alberts/go-oidc,sym3tri/go-oidc,jboeuf/go-oidc,sym3tri/go-oidc,gtank/go-oidc,yifan-gu/go-oidc,gtank/go-oidc,ashishgandhi/go-oidc,coreos/go-oidc,jboeuf/go-oidc,yifan-gu/go-oidc,ashishgandhi/go-oidc,coreos/go-oidc