Add new icon "Add to basket" (WP Shaken Grid)

Hi everyone!
I’m new to WP-devellopment and html – coding, so looking for a help in such a customization of Shaken Grid 2.0 Premium theme.

On the posts page (here) when user hovers over the post image 3 icons became available:
– Enlarge
– Share
– Comment

I need to add one more icon (Add to Basket) , which will add post item (good) to the customer basket

Any help on ideas & code customization is needed (includes/action-buttons.php)
I can pay for it

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