Cranston City Council is expected to ask the state to require schools to have metal detectors at all entrances and arm specially trained officers.  The resolution to be taken up at today's meeting is proposed by the five Republican council members and comes two weeks after the deadly shootings at a Florida school.  School Committee Chairwoman Janice Ruggieri says the schools already have video surveillance, resources officers, teachers have fobs to get into secure areas and visitors have to be buzzed into buildings.