What can a rooster eat from my kitchen?

For the past month or so, I’ve had a rooster hanging out around my house all day everyday. I know he belongs to someone but it’s extremely odd because I live at the end of a culdesac in a big HOA subdivision that definitely doesn’t allow these types of animals. My neighbors have posted on all the social media sites asking who he belongs to but no one will claim him. I’m sure he’s surviving off of bugs and worms but at this point I’d like to leave a little food out for him without having to actually go and buy chicken feed. Does anyone have suggestions for foods I might have that he would eat and are safe? Thanks