How to get WiFi in the outbuilding?

Hi

I have a setup where I got a decent WiFi router in the house and it serves all rooms really well however the signal is too weak to reach the outbuilding. I have ran a CAT6 cable to the outbuilding and that works perfectly for providing internet to the PC which is located there however I also want to get good WiFi signal in the outbuilding.

Can someone please help me and let me know what device I need to buy that will receive ethernet signal from my CAT6 cable and turn it into WiFi inside the outbuilding?

See quick diagram I made for a visual explanation:

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https://imgur.com/a/Q1rBLgG

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Thanks!