#3 Write docs

[IlyaLisov]

PR-Codex overview

This PR focuses on refactoring the storage service implementation classes.

Detailed summary

• The code has been refactored to use a common find method instead of duplicating code in each service implementation.
• The exists and delete methods have also been refactored to use the find method internally.
• The MinIOStorageServiceImpl and FirebaseStorageServiceImpl classes have been updated to use the find method instead of duplicating code.
• The README.md file has been updated with detailed instructions on how to use the library and contribute to it.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e04e875) 93.54% compared to head (3316c33) 92.52%.

Additional details and impacted files

@@             Coverage Diff              @@
##                dev      #17      +/-   ##
============================================
- Coverage     93.54%   92.52%   -1.03%     
+ Complexity       49       46       -3     
============================================
  Files             5        5              
  Lines           248      214      -34     
  Branches         10        8       -2     
============================================
- Hits            232      198      -34     
  Misses           13       13              
  Partials          3        3              

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