Add EIP: Buyer-Seller Negotiable Pricing Mechanism

[admi-n]

Allows buyers and sellers to freely negotiate and determine transaction prices on the Ethereum network. The seller sets the initial price, and the buyer can propose a new price through negotiation with the seller, and eventually both parties can reach an agreement and complete the transaction.

ATTENTION: ERC-RELATED PULL REQUESTS NOW OCCUR IN ETHEREUM/ERCS

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When opening a pull request to submit a new EIP, please use the suggested template: https://github.com/ethereum/EIPs/blob/master/eip-template.md

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[eth-bot]

File EIPS/eip-xxx.md

Requires 1 more reviewers from @axic, @g11tech, @gcolvin, @lightclient, @SamWilsn

[abcoathup]

Application layer standards should be created in the ERC repo: https://github.com/ethereum/ercs
Please close this PR and if you want to draft an ERC, open a PR in the ERC repo.

[github-actions]

The commit 7a43cf4 (as a parent of e39f697) contains errors.
Please inspect the Run Summary for details.