added gitignore file
added gitignore file

firebase/geofire-objc,firebase/geofire-objc,ObjSal/geofire-objc,ObjSal/geofire-objc,firebase/geofire-objc,victoraliss0n/geofire-objc,victoraliss0n/geofire-objc,ObjSal/geofire-objc,firebase/geofire-objc,victoraliss0n/geofire-objc