Added doc to local_update.
Added doc to local_update.

picoCTF/picoCTF-shell-manager,cganas/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,cganas/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,picoCTF/picoCTF-shell-manager,cganas/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,RitwikGupta/picoCTF-shell-manager,cganas/picoCTF-shell-manager