added README and LICENSE

MIT-LICENSE.txt

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+Copyright (c) 2013 Enrique García Cota
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+sandbox.lua
+===========
+
+A pure-lua solution for running untrusted Lua code.
+
+For now, sandbox.lua only works with Lua 5.1.x.
+
+Usage
+=====
+
+    local sandbox = require 'sandbox'
+
+    -- sandbox can handle both strings and functions
+    local msg  = sandbox(function() return 'this is untrusted code' end)
+    local msg2 = sandbox("return 'this is also untrusted code'")
+
+    sandbox(function()
+      -- see sandbox.lua for a list of safe and unsafe operations
+      return ('I can use safe operations, like string.upper'):upper()
+    end)
+
+    -- Attempting to invoke unsafe operations (such as os.execute) is not possible
+    sandbox(function()
+      os.execute('rm -rf /') -- this will throw an error, no damage don
+    end)
+
+    -- It is not possible to exhaust the machine with infinite loops; the following
+    -- will throw an error after invoking 500000 instructions:
+    sandbox('while true do end')
+
+    -- The amount of instructions executed can be tweaked via the quota option
+    sandbox('while true do end', {quota=10000}) -- throw error after 10000 instructions
+
+    -- It is also possible to use the env option to add additional variables to the environment
+    sandbox('return foo', {env = {foo = 'This was on the environment'}})
+
+Installation
+============
+
+Just copy sandbox.lua wherever you need it.
+
+License
+=======
+
+This library is released under the MIT license. See MIT-LICENSE.txt for details
+
+Specs
+=====
+
+This project uses [busted](http://olivinelabs.com/busted/) for its specs. In order to run them, install `busted` and then:
+
+    cd /path/to/where/the/spec/folder/is
+    busted
+
+
+
+
+