Add Preemptive & Non-Preemptive Scheduling Algorithm

[ChaitanyaShah26]

• 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

❌ Patch coverage is 0% with 130 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.51%. Comparing base (f66da5e) to head (1e10906).

Files with missing lines	Patch %	Lines
...scheduling/Preemptive&NonPreemptiveScheduling.java	0.00%	130 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6912      +/-   ##
============================================
- Coverage     77.98%   77.51%   -0.47%     
+ Complexity     6436     6435       -1     
============================================
  Files           736      737       +1     
  Lines         21499    21629     +130     
  Branches       4201     4220      +19     
============================================
  Hits          16765    16765              
- Misses         4063     4193     +130     
  Partials        671      671              

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