ClientCollection builder methods returns with client (#13437)

Author: tibitoth

src/Identity/ApiAuthorization.IdentityServer/src/Options/ClientCollection.cs

@@ -68,35 +68,41 @@ public void AddRange(params Client[] clients)
         /// </summary>
         /// <param name="clientId">The client id for the single page application.</param>
         /// <param name="configure">The <see cref="Action{ClientBuilder}"/> to configure the default single page application.</param>
-        public void AddIdentityServerSPA(string clientId, Action<ClientBuilder> configure)
+        public Client AddIdentityServerSPA(string clientId, Action<ClientBuilder> configure)
         {
             var app = ClientBuilder.IdentityServerSPA(clientId);
             configure(app);
-            Add(app.Build());
+            var client = app.Build();
+            Add(client);
+            return client;
         }
 
         /// <summary>
         /// Adds an externally registered single page application.
         /// </summary>
         /// <param name="clientId">The client id for the single page application.</param>
         /// <param name="configure">The <see cref="Action{ClientBuilder}"/> to configure the default single page application.</param>
-        public void AddSPA(string clientId, Action<ClientBuilder> configure)
+        public Client AddSPA(string clientId, Action<ClientBuilder> configure)
         {
             var app = ClientBuilder.SPA(clientId);
             configure(app);
-            Add(app.Build());
+            var client = app.Build();
+            Add(client);
+            return client;
         }
 
         /// <summary>
         /// Adds an externally registered native application..
         /// </summary>
         /// <param name="clientId">The client id for the single page application.</param>
         /// <param name="configure">The <see cref="Action{ClientBuilder}"/> to configure the native application.</param>
-        public void AddNativeApp(string clientId, Action<ClientBuilder> configure)
+        public Client AddNativeApp(string clientId, Action<ClientBuilder> configure)
         {
             var app = ClientBuilder.NativeApp(clientId);
             configure(app);
-            Add(app.Build());
+            var client = app.Build();
+            Add(client);
+            return client;
         }
     }
 }