Lets add a section on GS1

[OR13]

With some introductory text, and a direct link to https://ref.gs1.org/gs1/vc/

We might also want to add GS1 as a participant, and have their credentials listed, under credentials of interest.

[paulfdietrich]

I can take this

[BenjaminMoe]

@paulfdietrich any updates?

[mkhraisha]

@paulfdietrich are you still interested in adding this in?

if so we'll need it soon for v1.0

[VladimirAlexiev]

@mgh128 ?

[mkhraisha]

@paulfdietrich any updates on this?

[mkhraisha]

Putting a pending-close label on this, if this is not updated within the next 2 weeks, we will close this issue.