SendClientMessage(playerid, COLOR_GOES_HERE, "Admins Online:");
new name[MAX_PLAYER_NAME];
for(new i = 0; i < MAX_PLAYERS; i++)
{
   if(IsPlayerConnected(i) && IsPlayerAdmin(i))
   {
       GetPlayerName(i, name, sizeof name)
       SendClientMessage(playerid, COLOR_GOES_HERE, name);
   }
}