Minor working and punctuation fixes for README
Minor working and punctuation fixes for README

vzambrano98/leaflet-google-sheets-template,jbsteverson/steverson_greenville_project,codeforgreenville/leaflet-google-sheets-template,vzambrano98/leaflet-google-sheets-template,codeforgreenville/leaflet-google-sheets-template,jbsteverson/steverson_greenville_project