Add return type for UserManager.Add

Users/UsersManager.cs

@@ -45,7 +45,7 @@ namespace Akari.Provider.WaveshareUART.Users
         public User this[string name] => _users.FirstOrDefault(u => u.Name.Equals(name, StringComparison.OrdinalIgnoreCase));
         public User this[ushort start] => _users.FirstOrDefault(u => u.Start == start);
 
-        public void Add(string name, string token)
+        public User Add(string name, string token)
         {
             // Find first available position
             var usedStarts = _users.Select(u => u.Start).ToHashSet();
@@ -60,9 +60,13 @@ namespace Akari.Provider.WaveshareUART.Users
             }
 
             // Add user
-            _users.Add(new User(name, token, (ushort)start));
+            var user = new User(name, token, (ushort)start);
+
+            _users.Add(user);
 
             Save();
+
+            return user;
         }
 
         public bool Remove(User user)