Add epic end portal open sound

mods/ITEMS/mcl_portals/README.md

@@ -10,6 +10,12 @@ Code license: MIT License (see `LICENSE`).
 
 Texture license: See README.md in main MineClone 2 directory.
 
-License of sound: [CC BY 3.0](http://creativecommons.org/licenses/by/3.0/)
-Authors: [FreqMan](https://freesound.org/people/FreqMan/) and Wuzzy
-Source: <https://freesound.org/people/FreqMan/sounds/32541/>
+`mcl_portals_teleport.ogg`
+	* License: [CC BY 3.0](http://creativecommons.org/licenses/by/3.0/)
+	* Authors: [FreqMan](https://freesound.org/people/FreqMan/) and Wuzzy
+	* Source: <https://freesound.org/people/FreqMan/sounds/32541/>
+
+`mcl_portals_open_end_portal.ogg`
+	* License: CC0
+	* Author: Johnnie\_Holiday
+	* Source: <https://freesound.org/people/Johnnie_Holiday/sounds/546571/>

mods/ITEMS/mcl_portals/portal_end.lua

@@ -362,6 +362,8 @@ minetest.register_node("mcl_portals:end_portal_frame_eye", {
 	on_construct = function(pos)
 		local ok, ppos = check_end_portal_frame(pos)
 		if ok then
+			-- Epic 'portal open' sound effect that can be heard everywhere
+			minetest.sound_play("mcl_portals_open_end_portal", {gain=0.8}, true)
 			end_portal_area(ppos)
 		end
 	end,