docs: Document all error codes with resolution steps

[Haroldwonder]

Expand the error codes table in README with common causes and resolution steps for each error.

[SamixYasuke]

@SamixYasuke has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi maintainer, I'd like to work on this issue

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[karanjakevin39-collab]

@karanjakevin39-collab has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

can i work on this issue , i will make sure everything is up to date

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[drips-wave]

Congratulations, @karanjakevin39-collab! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

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[drips-wave]

This issue has been completed by @karanjakevin39-collab as part of the Stellar Wave Program's 4th Wave 🥳

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