feat: add basis for user scheme

[statnmap]

tags: feat, doc

Why?

• Need an overview of steps of use of the package

What?

• Add excalidraw JSON output

issue #20

• Does my code meet the quality standards for release packages?
• Does the reviewer have all the information to validate the features/issues without too much research?
• Does the customer who will validate the associated tickets have the information to do so without wasting time?

Issues to validate to close :

• [ ] issue #

Processed issues to keep open or in progress:

• [ ] issue #

Checklist:

• [ ] Does the package check works locally?
• [ ] Does the CI pass?
• [ ] Are the added / fixed features documented, tested?
• [ ] Are the added features / solved problems briefly presented in the PR message?
• [ ] Are the changes related to tickets / issues that I have listed in the commits and in the PR itself?
• [ ] Are the tickets in "review" mode in the Project Tracking Board?
• [ ] Does each ticket, if it is to be closed after acceptance of the PR, contain a comment that tells how to validate it?