GetKeyTitle is a helper function that generates a title for the RSA public key based on the username and domain name.

IsAdmin is a helper function that returns true if the user has Admin access to the repository.

IsRead is a helper function that returns true if the user has Read-only access to the repository.

IsWrite is a helper function that returns true if the user has Read-Write access to the repository.

NewClient is a helper function that returns a new GitHub client using the provided OAuth token.