Adding new (custom) weapons to FTS: Stronghold

My name is Infinitext, and i own a server running the gamemode “FTS: Stronghold”.
I have had requests to add new guns to the server, how would i go about doing this?
I have downloaded a random SWEP named ‘Jihad Bomb’ and i thought it would be cool
if i was to add this SWEP to the game. Thanks.

EDIT
Since the Jihad bomb addon IS an addon, it includes the usual folders (Materials, lua, sound, model and of course info)
I thought if i was to copy those folders into the server’s stronghold folder (located inside Garrysmod/garrysmod/gamemodes/stronghold)
it would work. Haven’t tried. All help is appreciated.

Try placing the addon in the normal addons folder (install it as if in sandbox) then use gm_giveswep to give yourself the weapon. The weapons name is the name of the folder containing the LUA scripts.

Thanks. That will come in handy, but i meant so other players could buy it ingame, instead of them having to use admin commands. Very helpful though