Am I morally obligated to keep this cat?

A couple of days ago I spotted a very friendly cat outside my garage door, and she was meowing at me. I just whent back inside, got ready and whent back our and didn't see it. I went to town, and later that night the cat was in my garage meowing. This is how my garage is set up. There is a car port on the side of my house leading into a door (which I leave open) and leads my pantry, then after that, my garage. So I put out some food and it was very hungry. I was gonna take it to the vet and have it scanned for a microchip. If it turns out not to have a chip then I was going to iether keep it (unlikely) or take it to the humane society.

Am I morally obligated to keep this cat?
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