Drag and drop both files into your cstrike\maps folder. Location will mostly likely resemble:
C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Source\cstrike\maps

If installing to a server, you no doubt know this already, drop into the maps folder in your server and your fastlDL/ whatever it is you guys use now

Thanks for downloading, perhaps more maps to come in the future? 8)