added registration for hybrid back channel sample
added registration for hybrid back channel sample

chrisowhite/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,chrisowhite/IdentityServer4,MienDev/IdentityServer4,IdentityServer/IdentityServer4,IdentityServer/IdentityServer4,chrisowhite/IdentityServer4,MienDev/IdentityServer4