#683: Add Player#showDemoScreen

By: coll1234567 <joshl5324@gmail.com>

paper-api/src/main/java/org/bukkit/entity/Player.java

@@ -1308,6 +1308,14 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
      */
     public void openBook(@NotNull ItemStack book);
 
+    /**
+     * Shows the demo screen to the player, this screen is normally only seen in
+     * the demo version of the game.
+     * <br>
+     * Servers can modify the text on this screen using a resource pack.
+     */
+    public void showDemoScreen();
+
     /**
      * Gets whether the player has the "Allow Server Listings" setting enabled.
      *