Add WP Playground blueprint

[jaymcp]

Description

Adds a WP Playground blueprint that provides a live example of the plugin in use.
Note: the step that adds the block to a post is non-standard, because the purported standard way breaks the block comments for some reason.

Change Log

• Add WP Playground blueprint

Steps to test

Visit the Playground: https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/bigbite/image-comparison/3f295469c9a0c42d08c88906278e3c93cbaa9c2c/docs/playground/blueprint.json

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[jonnywatersbb]

Had a little nosey around the docs, but wasn't sure how easy it was to configure the initial setup. For example, is it easy enough to:

• Turn off comments
• Change title to something like Image Comparison Example

[jaymcp]

Sure, that can be done.

[jaymcp]

I've updated the blueprint. However, because the image target branch doesn't actually included the images yet, updating the blueprint URI to the latest commit on this branch won't work. So here's an alternative link for you to view it at: playground

[g-elwell]

LGTM