Add scene description

[callemand]

Pull Request check-list

To ensure your Pull Request can be accepted as fast as possible, make sure to review and check all of these items:

• If your changes affects code, did your write the tests?
• Are tests passing? (npm test on both front/server)
• Is the linter passing? (npm run eslint on both front/server)
• Did you run prettier? (npm run prettier on both front/server)
• If you are adding a new features/services, did you run integration comparator? (npm run compare-translations on front)
• Did you test this pull request in real life? With real devices? If this development is a big feature or a new service, we recommend that you provide a Docker image to the community for testing before merging.
• [ ] If your changes modify the API (REST or Node.js), did you modify the API documentation? (Documentation is based on comments in code)
• [ ] If you are adding a new features/services which needs explanation, did you modify the user documentation? See the GitHub repo and the website.
• [ ] Did you add fake requests data for the demo mode (front/src/config/demo.js) so that the demo website is working without a backend? (if needed) See https://demo.gladysassistant.com.

NOTE: these things are not required to open a PR and can be done afterwards / while the PR is open.

Description of change

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (1dda59b) 97.79% compared to head (0167296) 97.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1778      +/-   ##
==========================================
+ Coverage   97.79%   97.81%   +0.01%     
==========================================
  Files         702      705       +3     
  Lines       10852    10880      +28     
==========================================
+ Hits        10613    10642      +29     
+ Misses        239      238       -1     

Impacted Files	Coverage Δ
server/lib/scene/scene.duplicate.js	100.00% <ø> (ø)
server/lib/scene/scene.get.js	100.00% <ø> (ø)
server/models/scene.js	93.75% <ø> (ø)

... and 15 files with indirect coverage changes

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