Add Server.getMaxPlayers

By: Erik Broes <erikbroes@grum.nl>

paper-api/src/main/java/org/bukkit/Server.java

@@ -31,6 +31,13 @@ public interface Server {
      */
     public Player[] getOnlinePlayers();
 
+    /**
+     * Get the maximum amount of players which can login to this server
+     *
+     * @return The amount of players this server allows
+     */
+    public int getMaxPlayers();
+
     /**
      * Broadcast a message to all players.
      *