Update README
Update README

Make it even more clear that commands should be run in command line
codefortulsa/citygram,openchattanooga/citygram,shravan20084312/citygram,codefortulsa/citygram,BetaNYC/citygram-nyc,codeforamerica/citygram,beetz12/citygram,shravan20084312/citygram,shravan20084312/citygram,BetaNYC/citygram-nyc,chriswhong/citygram,codeforamerica/citygram,elberdev/citygram-nyc,BetaNYC/citygram-nyc,codeforamerica/citygram,openchattanooga/citygram,codeforamerica/citygram,elberdev/citygram-nyc,beetz12/citygram,BetaNYC/citygram-nyc,beetz12/citygram,chriswhong/citygram,elberdev/citygram-nyc,codefortulsa/citygram