How to add maps to CS 1.6 server?
Folders that can go with the map:
• maps - map.
• sound - music.
• gfx - image files.
• models - models.
• sprites - effects.

File: Folder:
.txt\maps
.bsp\maps
.tga\gfx\env
.wav\sound
.spr\sprites
.mdl\models
.nav\maps
.res\maps
.wad\cstrike

After you upload the files in folders to the server, you need to specify the name of the map in the maps.ini and mapcycle.txt file exactly as the .bsp file is named, for example, like this:
de_dust2

The maps.ini file is located in: "cstrike/addons/amxmodx/configs/maps.ini"
The file mapcycle.txt is located in: "cstrike/mapcycle.txt"
All installation is over!