Linear Search Algorithm in Java

[farheen-shaikh530]

Added a simple Linear Search algorithm in Java under Search/LinearSearch.java. Includes explanatory comments and a sample test run.

• 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 74.06%. Comparing base (7602f1e) to head (9d54909).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6277      +/-   ##
============================================
- Coverage     74.07%   74.06%   -0.01%     
+ Complexity     5351     5350       -1     
============================================
  Files           677      677              
  Lines         18648    18648              
  Branches       3621     3621              
============================================
- Hits          13813    13812       -1     
  Misses         4276     4276              
- Partials        559      560       +1     

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[DenizAltunkapan]

already implemented in https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/searches/LinearSearch.java