Add quick play helpers to add users/rounds

Author: smoogipoo

osu.Game/Online/Multiplayer/MatchTypes/Matchmaking/MatchmakingRoundList.cs

@@ -25,23 +25,26 @@ public class MatchmakingRoundList : IEnumerable<MatchmakingRound>
         /// Creates or retrieves the score for the given round.
         /// </summary>
         /// <param name="round">The round.</param>
-        public MatchmakingRound this[int round]
-        {
-            get
-            {
-                if (RoundsDictionary.TryGetValue(round, out MatchmakingRound? score))
-                    return score;
-
-                return RoundsDictionary[round] = new MatchmakingRound { Round = round };
-            }
-        }
+        public MatchmakingRound this[int round] => GetOrAdd(round);
 
         /// <summary>
         /// The total number of rounds.
         /// </summary>
         [IgnoreMember]
         public int Count => RoundsDictionary.Count;
 
+        /// <summary>
+        /// Retrieves or adds a <see cref="MatchmakingRound"/> entry to this list.
+        /// </summary>
+        /// <param name="round">The round.</param>
+        public MatchmakingRound GetOrAdd(int round)
+        {
+            if (RoundsDictionary.TryGetValue(round, out MatchmakingRound? score))
+                return score;
+
+            return RoundsDictionary[round] = new MatchmakingRound { Round = round };
+        }
+
         public IEnumerator<MatchmakingRound> GetEnumerator() => RoundsDictionary.Values.GetEnumerator();
 
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();

osu.Game/Online/Multiplayer/MatchTypes/Matchmaking/MatchmakingUserList.cs

@@ -25,23 +25,26 @@ public class MatchmakingUserList : IEnumerable<MatchmakingUser>
         /// Creates or retrieves the user for the given id.
         /// </summary>
         /// <param name="userId">The user id.</param>
-        public MatchmakingUser this[int userId]
-        {
-            get
-            {
-                if (UserDictionary.TryGetValue(userId, out MatchmakingUser? user))
-                    return user;
-
-                return UserDictionary[userId] = new MatchmakingUser { UserId = userId };
-            }
-        }
+        public MatchmakingUser this[int userId] => GetOrAdd(userId);
 
         /// <summary>
         /// The total number of users.
         /// </summary>
         [IgnoreMember]
         public int Count => UserDictionary.Count;
 
+        /// <summary>
+        /// Retrieves or adds a <see cref="MatchmakingUser"/> entry to this list.
+        /// </summary>
+        /// <param name="userId">The user ID.</param>
+        public MatchmakingUser GetOrAdd(int userId)
+        {
+            if (UserDictionary.TryGetValue(userId, out MatchmakingUser? user))
+                return user;
+
+            return UserDictionary[userId] = new MatchmakingUser { UserId = userId };
+        }
+
         public IEnumerator<MatchmakingUser> GetEnumerator() => UserDictionary.Values.GetEnumerator();
 
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();