Initial DI attempt

src/Umbraco.Web.BackOffice/Extensions/UmbracoBackOfficeServiceCollectionExtensions.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.Identity;
+using Microsoft.Extensions.DependencyInjection;
+using Umbraco.Core.Mapping;
+using Umbraco.Web.BackOffice.Identity;
+
+namespace Umbraco.Extensions
+{
+    public static class UmbracoBackOfficeServiceCollectionExtensions
+    {
+        public static void AddUmbracoBackOfficeIdentity(this IServiceCollection services)
+        {
+            services.AddIdentity<BackOfficeIdentityUser, IdentityRole>()
+                .AddDefaultTokenProviders()
+                .AddUserStore<BackOfficeUserStore>();
+
+            // .AddClaimsPrincipalFactory<UserClaimsPrincipalFactory<BackOfficeIdentityUser, IdentityRole>>() // TODO: extract custom claims principal factory
+            // .AddUserManager<BackOfficeUserManager<BackOfficeIdentityUser>>()
+        }
+    }
+}