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SO is it CC0?

Yes, it is CC0 

In this case you should add license metadata. Read here how to do it

thanks that was helpful

(+1)

I just remembered one thing. Because it is CC0 I also recommend you to upload it to OGA (OpenGameArt). They allow links in the description and people that view asstes on OGA usually open links so it can increase count of views on itch and spread your assets between bigger audience.

thanks a lot for helping me out.

(+1)

I recommend you to add tileset and tilemap tags

thanks again for the tips you really helped me a lot.