add mod 'galaxybox'

this is basicly a workaround since creating and calculating proper tiles from an own choosen image takes too long atm

mods/galaxybox/README.txt

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+Galaxy Skybox
+Version 1.0.0
+
+A mod for Minetest.
+
+This mod adds a simple skybox showing a galaxy.
+
+
+License of skybox textures:
+CC-BY and CC-BY-SA - From hackcraft.de <http://hackcraft.de/>.
+
+License of everything else: WTFPL

mods/galaxybox/description.txt

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+Adds a simple galaxy skybox.

mods/galaxybox/init.lua

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+minetest.register_on_joinplayer(function(player)
+	minetest.after(0,function()
+		player:set_sky(
+			{r=0x13, g=0x01, b=0x24},
+			"skybox",
+			{
+			"galaxybox_1.png^[transform6",
+			"galaxybox_2.png",
+			"galaxybox_3.png^[transform7",
+			"galaxybox_4.png^[transform1",
+			"galaxybox_5.png^[transform4",
+			"galaxybox_6.png",
+			}
+		)
+		--player:override_day_night_ratio(0.15)
+	end)
+end)