Adding shimmer to the app

[julien4215]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 54.77%. Comparing base (0d9fc27) to head (5889f00).
Report is 2 commits behind head on main.

Files	Patch %	Lines
...dation/repositories/recommendation_repository.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #350      +/-   ##
==========================================
- Coverage   54.78%   54.77%   -0.02%     
==========================================
  Files         166      166              
  Lines        3665     3666       +1     
==========================================
  Hits         2008     2008              
- Misses       1657     1658       +1     

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