feat: add command init (to create template game)

[RodrigoDornelles]

in the terminal use the command

lua cli.lua init @helloworld myproject

the command must be create this files:

• myproject/.gitignore

dist/
vendor/
.DS_Store
Thumbs.db

• myproject/README.md

# Myproject

 * **use:** `./cli.sh run src/game.lua`

• myproject/src/game.lua

local function init(std, game)

end

local function loop(std, game)

end

local function draw(std, game)
   std.draw.clear(std.color.black)
   std.draw.color(std.color.white)
   std.draw.text(8, 8, "hello world")
end

local function exit(std, game)

end

local P = {
    meta={
        title='Myproject',
        author='YourName',
        description='description about the game',
        version='1.0.0'
    },
    callbacks={
        init=init,
        loop=loop,
        draw=draw,
        exit=exit
    }
}

return P