Added Lua.

src/doublesgame.lua

@@ -0,0 +1,39 @@
+-- Copyright (C) 2017 Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net> All rights reserved.
+-- Author: Ortega Froysa, Nicolás <deathsbreed@themusicinnoise.net>
+--
+-- This software is provided 'as-is', without any express or implied
+-- warranty. In no event will the authors be held liable for any damages
+-- arising from the use of this software.
+--
+-- Permission is granted to anyone to use this software for any purpose,
+-- including commercial applications, and to alter it and redistribute it
+-- freely, subject to the following restrictions:
+--
+-- 1. The origin of this software must not be misrepresented; you must not
+--    claim that you wrote the original software. If you use this software
+--    in a product, an acknowledgment in the product documentation would be
+--    appreciated but is not required.
+--
+-- 2. Altered source versions must be plainly marked as such, and must not be
+--    misrepresented as being the original software.
+--
+-- 3. This notice may not be removed or altered from any source
+--    distribution.
+
+local n = 1
+
+while(true) do
+	local a
+	io.write("2^", n, "=")
+	a = io.read("*number")
+
+	if(a == 0) then
+		print("Goodbye!")
+		break
+	elseif(a == 2 ^ n) then
+		print("Correct!")
+		n = n + 1
+	else
+		print("Wrong answer, try again.")
+	end
+end