Kruskal Algorithm added

[jyotiv06]

Fixes #7067

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

I Successfully added the KruskalAlgorithm.java file in the directory as mentioned!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.25%. Comparing base (9f2b675) to head (24ad536).

Files with missing lines	Patch %	Lines
...ealgorithms/greedyalgorithms/KruskalAlgorithm.java	0.00%	58 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7074      +/-   ##
============================================
- Coverage     78.46%   78.25%   -0.21%     
+ Complexity     6738     6737       -1     
============================================
  Files           757      758       +1     
  Lines         22317    22375      +58     
  Branches       4380     4389       +9     
============================================
  Hits          17510    17510              
- Misses         4104     4162      +58     
  Partials        703      703              

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