Hi,
HikaShop already supports SVG images.
If you go in the HikaShop configuration, under the section "Images", you'll have the "allowed images" setting. By default it's set to: gif,jpg,jpeg,png,svg
So if you don't have the svg extension in the list because you've removed it, or because you've updated from an old version of HikaShop which didn't support SVG images, you can just add it there and it will work.
