Add ERC: Token Standard

[Dustinturner44]

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[eip-review-bot]

File ERCS/erc-20.md

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

[abcoathup]

@Dustinturner44 this looks like a spam PR as all you have done is change the filename for ERC20. Recommend closing.

[github-actions]

The commit bb06e9a (as a parent of 975762c) contains errors.
Please inspect the Run Summary for details.