Display selections metadata

[FadyCoding]

Is your feature request related to a problem? Please describe.
I want to display more data about a selection, the data is specific to my project.

Describe the solution you'd like
A way to add a json / object / dict / anything to a selection on her creation, the content of the metadata is displayed on the front page

TODO

• Modify DebiAI Backend to accept store selections metadata on the Web-Data-provider API
• Modify DebiAI Backend to provide selection metadata when requested the selections
• Modify the DebiAI Frontend to display the selections metadata
• Modify the DebiAI NodeJs template to add some metadata and add the documentation
• Modify the DebiAI documentation on how to add metadata with the Python module and how to read it in the frontend