NFT standard

note

Migrate and Rewrite:

• https://starcoin.org/zh/developer/blog/starcoin_merkle_nft/

• https://starcoin.org/en/developer/blog/starcoin_merkle_nft/

• https://starcoin.org/zh/developer/blog/starcoin_nft_application/

• https://starcoin.org/en/developer/blog/starcoin_nft_application/