Add further reading link about stateless ethereum

[jsign]

This PR adds https://stateless.fyi as a further reading doc. This site was announced last Monday in SIC call #30.

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

[wackerow]

Hey @jsign! Sorry for delays here, this looks good.. pulling in!

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[wackerow]

@all-contributors please add @jsign for doc

[allcontributors]

@wackerow

I've put up a pull request to add @jsign! 🎉