adding readme

git-tfs-id: [http://csmwebstage:8080/tfs/WebDevelopment]$/SocrataOpenData/SODA/TestGitTfs;C2060
add new section to readme

git-tfs-id: [http://csmwebstage:8080/tfs/WebDevelopment]$/SocrataOpenData/SODA/TestGitTfs;C2061