Finally added MIT copyrights to my SPA-Cart and Embed-cart

Hello,

I was thinking a lot - why write MIT copyrights to SPA-Cart and Embed-Cart.

Next I was thinking why not open it to all developers.

Was thinking a lot.

Finally got scared that people will forget about me.

So I added MIT copyrights above each PHP, JS and CSS files.

Regards,
Oleg