Add EIP-6147: Guard of NFT/SBT, an Extension of EIP-721 (#6147)
* Create eip-draft_tittle_GONS.md
* Update and rename eip-draft_tittle_GONS.md to eip-6147.md
* Update eip-6147.md
* Update eip-6147.md
* Update eip-6147.md
* Update eip-6147.md
* Update eip-6147.md
* Update eip-6147.md
* Apply suggestions from code review
Co-authored-by: Sam Wilson <57262657+SamWilsn@users.noreply.github.com>
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