Docs: How to create block pattern

[jorgecontreras]

Closes #36688.

Description

Add how to guide to create block pattern using The Good Docs Project template

How has this been tested?

Confirmed all steps are correct by following them on local setup.

Screenshots

Types of changes

Documentation

Checklist:

• I've included developer documentation if appropriate. <!-- Handbook: https://developer.wordpress.org/block-editor/ --

[github-actions]

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[carolinan]

Thank you for the PR!
I would like to see a little bit more context about assembling the blocks in the editor and copying the code from the editor to the PHP function.
It does not have to be very long.

Perhaps also include how to register a pattern category?

The text in the example code needs to be wrapped inside translation functions.

The image needs to be moved from the external staging site; or perhaps there are already existing images that can be used.
@mkaz may know.

[mkaz]

There are also some images and sample code from the News article on Patterns:
https://wordpress.org/news/2021/03/so-you-want-to-make-block-patterns/

It would be fine to use the full URL to the images and keep them directly hosted there.

[skorasaurus]

Thanks for your work on this. Since your pull request, documentation regarding block patterns has been merged in (https://developer.wordpress.org/block-editor/reference-guides/block-api/block-patterns/) ; making the content in this PR unnecessary.