test: added for Linear Search Algorithm

[HRIDYANSHU054]

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Describe your change:

Added tests and Wikipedia reference for Linear Search Algo

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new JavaScript files are placed inside an existing directory.
• All filenames should use the UpperCamelCase (PascalCase) style. There should be no spaces in filenames.
  Example:UserProfile.js is allowed but userprofile.js,Userprofile.js,user-Profile.js,userProfile.js are not
• All new algorithms have a URL in their comments that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.11%. Comparing base (ff314a2) to head (cbea1fe).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1753      +/-   ##
==========================================
+ Coverage   84.76%   85.11%   +0.34%     
==========================================
  Files         378      378              
  Lines       19742    19740       -2     
  Branches     2955     2967      +12     
==========================================
+ Hits        16735    16801      +66     
+ Misses       3007     2939      -68     

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[appgurueu]

I don't think a trivial linear search needs a lot of test coverage but why not.