Add ERC: Token with built-in AMM

[Thaoxuanduong]

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[eip-review-bot]

File ERCS/Token with built-in AMM.md

Requires 2 more reviewers from @g11tech, @lightclient, @samwilsn, @xinbenlv

[github-actions[bot]]

There has been no activity on this issue for six months. It will be closed in 7 days if there is no new activity. If you would like to move this PR forward, please respond to any outstanding feedback or add a comment indicating that you have addressed all required feedback and are ready for a review.