Added permutation in strings problem in sliding window section

[m-saurabh01]

Added 1 problem in sliding window section

Problem name: Permutation in Strings Source: Leetcode

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes missing coverage. Please review.

Project coverage is 72.30%. Comparing base (bca8d0e) to head (1461a37).

Files with missing lines	Patch %	Lines
...ealgorithms/slidingwindow/PermutationInString.java	0.00%	19 Missing :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6046      +/-   ##
============================================
- Coverage     72.40%   72.30%   -0.10%     
+ Complexity     4983     4982       -1     
============================================
  Files           653      654       +1     
  Lines         17574    17593      +19     
  Branches       3386     3393       +7     
============================================
- Hits          12724    12721       -3     
- Misses         4371     4391      +20     
- Partials        479      481       +2     

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[siriak]

We don't add Leetcode problems