Can you add an outlet onto the gfi next to the circuit breaker panel?
If t hat GFI is the only plug on the circuit then yes. If there
are other plugs you have to find out how many so that you don't
exceed the capacity of that circuit.
If the GFI is the only plug there, turn the power off to it at
it's breaker and run the appropriate wire to the new plug you want
to install. Wire in the new plug, then make the connections at the
old GFI plug. Always work towards the power, even if the circuit is
dead. It's good practice. This way you rarely if ever have to work
on live circuits. Start at the furthest point in the circuit away
from the electrical panel and work toward it.
You can have the new outlet protected by the GFI if you connect
the wires from the new outlet to the LOAD side of the GFI. If the
GFI is still new there is usually a yellow sticker covering the
screws, those 2 screws are the LOAD side meaning that if anything
happens downstream on that circuit to make a GFI trip the GFI will
sense it and turn the circuit off.
If you want just a standard outlet then put the new wires on the
same screws as the old wires on the GFI. Once you're done, and all
the boxes are closed and safe, turn the breaker back on.