luaConvert table to string

We'll use cjson module to convert table to string representation:

local cjson = require "cjson"
str_table = cjson.encode(table)ctrl + cgithub

`require "cjson"` load cjson module to work with JSON	`str_table` will convert string representation of a table
`table` table to convert to string	`cjson.encode` encode given object to JSON

local cjson = require "cjson"
t={{1,2,3},{4,5,6}}
print(cjson.encode(t))

[[1,2,3],[4,5,6]]