EIP5007: TimeNFT, ERC-721 Time Extension (#5007)
* add eip-TimeNFT.md
* add Reference Implementation
* update code
* update Implementation code
* add test code
* update test code
* update code
* update test code
* rename file name
* remove spaces
* update Reference Implementation
* update title
* update by SamWilsn's suggestion
* update Backwards Compatibility
* update code
* simplify EIP5007
* remove empty lines
* udpate readme
* update readme
* update Test Cases
* fix link in readme.md
* fix link in readme.md
* remove function isValidNow
* update Copyright
* update copyright
* change EIP5007 to EIP-5007
Co-authored-by: anders <>
Co-authored-by: Anders <anders@emojidao.org>
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