Add a scope section in OID4VP

[Nat Sakimura]

While earlier documents at OIDF do not have it, I found it quite useful to follow the ISO tradition to add a scope of the document at the begining so that it will be clear for the readers what this document explains.

Please see FAPI Advanced for example.

https://openid.net/specs/openid-financial-api-part-2-1_0.html

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[Kristina Yasuda]

Nat, would you agree that Introduction section of OIDC4VP specification defines scope of OIDC4VP?

https://openid.net/specs/openid-connect-4-verifiable-presentations-1_0.html#name-introduction

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[Kristina Yasuda]

If you do, we could split that introduction section into a scope section

[Kristina Yasuda]

addressed in PR 354. but wanted to comeback whether it should be closer to an overview in VCI. Concrete comment here: openid / connect / Pull Request #354: Restructure of OpenID4VP and SIOPv2 (pre ID-2) — Bitbucket

[Kristina Yasuda]

considering resolved with PR #354 merged.