Monorepo: create `core` package

[marcalexiei]

I think the monorepo skeleton is now complete.

Here is how I suggest we proceed:

1. Since you are more familiar with the source, you can create a package with the relevant files and consume it from the backend and frontend workspaces (add it as a dependency using the workspace:* protocol).
2. Once that is done, I can take care of generating the dist folder with the artifacts that will be published to npm (JavaScript and .d.ts files produced by tsc).
3. We then decide which tool to use for automated publishing (e.g., Release Please, Changesets, etc.).
4. I will set up the publishing workflow.
5. Publish the package.
   I'll need access to npm org or you will have to publish the package your self and then setup OIDC.
6. After that is complete, we can repeat the same process for the cards package.

What do you think?

[martin-mfg]

Sounds good. 👍

I'll need some time to do step 1 though.

[marcalexiei]

Absolutely!
Once you’ve worked on it, I’m glad to take a look and review the PR if helpful.