Here are the gamemode configuration files.
Feel free to add your own gamemode - just copy paste from one the existing ones.

The first line specifies what game name that should be displayed in server browser and in splash with server settings data.
The second line is a help text displayed when someone types help in console.

Gamemode example with hints
============================
//AG TDM
//Team Death Match mode (FF1, WS0).

// Set the game type, this will be used inside of ag mod x to do some actions for special modes (arena, lts, etc).
sv_ag_gametype			""
sv_ag_pure 			    0

mp_teamlist				"scientist;barney"
mp_teamplay				1
mp_friendlyfire			1
mp_forcerespawn			0
mp_weaponstay			0
mp_timelimit			20
mp_fraglimit			0
mp_falldamage			0

sv_ag_lj_timer			0
sv_ag_wallgauss			1
sv_ag_headshot			3
sv_ag_blastradius		1
sv_ag_oldphysics		1
sv_ag_spawn_volume		1

// removes weapons from the map
sv_ag_ban_crowbar		0-1
sv_ag_ban_glock			0-1
sv_ag_ban_357			0-1
sv_ag_ban_mp5			0-1
sv_ag_ban_shotgun		0-1
sv_ag_ban_crossbow		0-1
sv_ag_ban_rpg			0-1
sv_ag_ban_gauss			0-1
sv_ag_ban_egon			0-1
sv_ag_ban_hornet		0-1
sv_ag_ban_hgrenade		0-1
sv_ag_ban_satchel		0-1
sv_ag_ban_tripmine		0-1
sv_ag_ban_snark			0-1

// removes ammunition from the map
sv_ag_ban_9mmar			0-1   // removes all 9mm ammo type from map
sv_ag_ban_m203			0-1
sv_ag_ban_bockshot		0-1
sv_ag_ban_uranium		0-1
sv_ag_ban_bolts			0-1
sv_ag_ban_rockets		0-1
sv_ag_ban_357ammo       0-1

// removes items and block the chargers from the map
sv_ag_ban_health		0-1   // removes health kits from map
sv_ag_ban_armour		0-1   // removes batteries from map
sv_ag_ban_recharg		0-1   // disables health and hev chargers
sv_ag_ban_longjump		0-1

// weapons to give to the player when he spawns
sv_ag_start_crowbar		0-1
sv_ag_start_glock		0-1
sv_ag_start_357			0-1
sv_ag_start_mp5			0-1
sv_ag_start_shotgun		0-1
sv_ag_start_crossbow	0-1
sv_ag_start_rpg			0-1
sv_ag_start_gauss		0-1
sv_ag_start_egon		0-1
sv_ag_start_hornet		0-1
sv_ag_start_hgrenade	0-10
sv_ag_start_satchel		0-5
sv_ag_start_tripmine	0-5
sv_ag_start_snark		0-15

// ammo to give to the player when he spawns
sv_ag_start_9mmar		0-255  // sets 9mm backpack ammo on player spawn
sv_ag_start_m203		0-10
sv_ag_start_bockshot	0-125
sv_ag_start_uranium		0-100
sv_ag_start_bolts		0-50
sv_ag_start_rockets		0-5
sv_ag_start_357ammo		0-36

// sets health, armor, and LJ to the player when he spawns
sv_ag_start_armour		0-100
sv_ag_start_health		0-100
sv_ag_start_longjump	0-1

// sets damage of weapons
sv_ag_dmg_crowbar           25
sv_ag_dmg_glock             12
sv_ag_dmg_357               40
sv_ag_dmg_mp5               12
sv_ag_dmg_shotgun	        20
sv_ag_dmg_bolts_normal		120 // using scope
sv_ag_dmg_bolts_explosion   40  // not using scope
sv_ag_dmg_rpg               120
sv_ag_dmg_gauss             20 
sv_ag_dmg_egon_wide         20  
sv_ag_dmg_egon_narrow       10  // ignored, only wide is used in multiplayer
sv_ag_dmg_hornet            10
sv_ag_dmg_hgrenade          100
sv_ag_dmg_satchel           120
sv_ag_dmg_tripmine          150
sv_ag_dmg_m203              100