Added algorithm for swapping linkedlist nodes

[Aashu-11]

The above algorithm helps in swapping nodes of linkedlists.

• 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

[Aashu-11]

@alxkm @BamaCharanChhandogi @siriak @yanglbme @vil02 please look after and merge my request

[Aashu-11]

please approve my request and kindly merge it

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 48 lines in your changes missing coverage. Please review.

Project coverage is 54.37%. Comparing base (f34fe4d) to head (8e4d9a9).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
.../thealgorithms/datastructures/lists/SwapNodes.java	0.00%	48 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5558      +/-   ##
============================================
- Coverage     54.56%   54.37%   -0.19%     
+ Complexity     3413     3412       -1     
============================================
  Files           535      536       +1     
  Lines         15383    15431      +48     
  Branches       2935     2944       +9     
============================================
- Hits           8393     8391       -2     
- Misses         6637     6686      +49     
- Partials        353      354       +1     

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[siriak]

Please remove printList and main methods, and add JUnit tests instead. And also check PR checks

[github-actions]

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[github-actions]

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