docs: add payload

[kakabisht]

This document covers:

• What is json schemas, and why to use them
• Specify json schemas in AsyncAPI
• Resume schema from component

Refer: #1515

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[asyncapi-bot]

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[derberg]

@alequetzalli I rewrote completely as there were many generic parts, so instead of talking about complex schemas (completely different document, about JSON schema allOf, anyOf, oneOf and many others) I rewrote it to talk about payload and how it is different now in v3, its tuple nature, schema formats and stuff

[quetzalliwrites]

@alequetzalli I rewrote completely as there were many generic parts...

Go it, sorry to hear you had to completely rewrite and we weren't able to use the writer's work for this doc. Thank you for going the extra mile and completely rewriting some of the docs ❤️, appreciate you! @derberg

[quetzalliwrites]

@kakabisht I would love to have you comment back on this PR and detail what you thought this doc was supposed to cover or where the confusion was, so we can identify how to improve instructions next year with writers 😸

[quetzalliwrites]

I'm proud of our work on this one, @derberg 😃

[quetzalliwrites]

/rtm