Add package.json

[CGarces]

npm run deploy fails if package.json not exist

Summary

The page sugest use
npm run deploy but package.json not exist on the diagram

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[kodster28]

Closing this out b/c we're solving the underlying issue in #21371