add taxonomy project whitepaper link

README.md

@@ -116,7 +116,7 @@ full implementation details.
    Channel or Item (optional | multiple)
 
    This element specifies a person of interest to the podcast.  It is primarily intended to identify people like hosts, co-hosts and guests.  Although, it is flexible enough to allow fuller credits to be given using the roles
-   and groups that are listed in the Podcast Taxonomy Project.  (link needed)
+   and groups that are listed in the Podcast Taxonomy Project.  (Whitepaper)[https://drive.google.com/file/d/1pkkb6_Kg7Dc33IVgTopJO7QNka3FnH7m/view]
 
    - `name` (required) This is the full name or alias of the person.
    - `role` (optional) Used to identify what role the person serves on the show or episode. This should be a reference to an official role within the Podcast Taxonomy Project list. If `role` is missing then "host" is assumed.