Adds a message when a player joins an arena

src/main/java/net/knarcraft/minigames/command/dropper/JoinDropperArenaCommand.java

@@ -99,6 +99,7 @@ public class JoinDropperArenaCommand implements CommandExecutor {
         } else {
             // Make sure to update the state again in the air to remove a potential swimming state
             newSession.getEntryState().setArenaState();
+            player.sendMessage(Message.SUCCESS_ARENA_JOINED.getMessage());
             return true;
         }
     }

src/main/java/net/knarcraft/minigames/command/parkour/JoinParkourArenaCommand.java

@@ -91,6 +91,7 @@ public class JoinParkourArenaCommand implements CommandExecutor {
         } else {
             // Make sure to update the state again in the air to remove a potential swimming state
             newSession.getEntryState().setArenaState();
+            player.sendMessage(Message.SUCCESS_ARENA_JOINED.getMessage());
             return true;
         }
     }