Cat Living in My Backyard?? ASAP?

[:'tsAdTeEn]

ok, so i have this cat who is living in my backyard its been 3 days that it has been here now its starting to look a little hungry. i did approach the cat and its defiantly not wild it lays on its back and lets me pet it. a couple questions

what should i do?

what can i feed it (too late to go buy cat food)?

should i bring it inside or let it be alone?

and what should i put on the posters im going to put up (i already a picture)?

thanks

tOrI