Create Hello-World.md

tutorials/Hello-World.md

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+# Hello World
+
+HUD stuff
+
+```Lua
+minetest.register_on_joinplayer(function(player)
+     local hud_id = player:hud_add({
+         hud_elem_type = 'text',
+         text = 'First text',
+         number = 0xFFFFFF,
+         position = {x=0, y=1},
+         alignment = {x=1, y=-1},
+         offset = {x=4, y=-4}
+     })
+end)
+```