Create ECC.java

[smritii73]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.37%. Comparing base (a163816) to head (6c4f37b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6036   +/-   ##
=========================================
  Coverage     72.37%   72.37%           
  Complexity     4981     4981           
=========================================
  Files           652      652           
  Lines         17569    17569           
  Branches       3385     3385           
=========================================
  Hits          12716    12716           
  Misses         4373     4373           
  Partials        480      480           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[siriak]

This doesn't implement the specified algorithm, but uses library-provided implementations