How to download greenfield city on minecraft for windows 8 laptop? Give me a step by step please?

Is that Greenfield thingy a map? If it is:
a) download the.zip file of the world
b) open it with extraction software (WinRAR, 7-Zip etc.)
c) extract the Greenfield City folder (not the stuff inside, the WHOLE folder) to: C:\Users\(username here)\AppData\Roaming\.minecraft
c.1) if you don't see the appdata folder, enable viewing hidden files by opening File Explorer and then just click View and then Hidden files.