Add ERC: Splitting and Merging of NFTs

[nitin312]

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

We have a GitHub bot that automatically merges some PRs. It will merge yours immediately if certain criteria are met:

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[eip-review-bot]

File ERCS/erc-7891.md

Requires 1 more reviewers from @g11tech, @SamWilsn, @xinbenlv

[github-actions]

The commit 90bbf90 (as a parent of 878bd65) contains errors.
Please inspect the Run Summary for details.

[SamWilsn]

Please stop opening new pull requests and instead update the already existing pull request. Continued spam will result in a ban.