Install: Put everything in maps into your csgo/maps folder, put the file in 
resource/flash into your csgo/resource/flash folder.

Mode: Arms Race/Arsenal, whatever it's called, you know the gungame one.

Name: Frostfire

Author: TotalMark, Zipper Interactive (Original Map), TopHatWaffle (Textures)

Hit CTRL+F and type "mg_ar_baggage" and than click Find.

Copy and paste the following into your gamemodes.txt:

//-----------------------------------------------------------------------------

"mg_ar_frostfire"	""

//-----------------------------------------------------------------------------

Hit CTRL+F and type "Single map groups" and than click Find.
Add this to that area. You can see there another maps as example.

//-----------------------------------------------------------------------------
"mg_ar_frostfire"
{
	"imagename"		"map-baggage-overall"
	"nameID"		"Frostfire"
	"name"			"mg_ar_frostfire"
	"maps"
	{
		"ar_frostfire"		""
	}
}
//-----------------------------------------------------------------------------
