Update ERC-7521: Add Prohibited Address Description

[Karotoka]

Adding the description of the functions included in the PR here.

Attempted to mirror the existing structure but feel free to edit or reject if inappropriate.

[eip-review-bot]

File ERCS/erc-7521.md

Requires 1 more reviewers from @pixelcircuits, @supiket

[pixelcircuits]

This would be better suited as an intent standard for ERC-7521 rather than being baked into the entrypoint itself. This way it's up to users to opt in and include a segment on their intent with these extra constraints.

Also, the full list of possibly touched contracts isn't fully known by just looking at intent data. For example, imagine a wrapper contract that just forwards calls to another contract, with the intent of obscuring the target contracts address.

[Karotoka]

This makes sense to me as the functionality is designed to be optional.

Can you direct me towards the correct repo that this should live in and I will submit it there? I'm a poor wordcell struggling through GitHub and had a hunch this may have been the wrong spot.

As for the possibly touched contracts - yes, I understand that structure and packing of intentData may cause problems extracting prohibited addresses. I don't think this can be resolved in the ERC7521 standard itself. The goal is to set a framework that users/builders can iterate on depending on their specs.

[pixelcircuits]

I think it makes the most sense to write an example intent standard contract and add it here. At least one that whitelists a solver by checking msg.origin.

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