[GNAP] client definition

[Tom Jones <[e-mail]>]

This definition is highly use case specific. It leaves out the possibility
of (eg) a self-issued identifier where the RP displays a request to the
user on a web page, the user clicks the button and the result is that a
wallet on the user's device acting as the AS sends an access token to the
RP (which is typically the client in an OAUTH sense.) The underlined part
is often incorrect.

Client

   - Definition: application *used by an end-user* to interact with an AS
   or a RS

suggestion: Client, an application that desires to get access privileges
from a user to resources on an RS, possibly by way of an AS.

Peace ..tom