function RespawnHook()
if not(LocalPlayer() and LocalPlayer():IsValid()) then return end // If you are not active and valid, then stop the code
    if LocalPlayer():Alive() == false then // If you are not alive then
        timer.Simple(1, function() RunConsoleCommand('+attack') end) // Wait 1 second, then run attack which respawns you. We wait 1 second because most servers have a spawn delay.
        timer.Simple(1.1, function() RunConsoleCommand("-attack") end) // Now stop the +attack function so that you can use it again without having to click it or type -attack in console.
    end
end
hook.Add("Think", "Respawn", RespawnHook)