Create AdaptiveMergeSort.java

[anant-jain01]

• 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

Attention: Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Project coverage is 62.88%. Comparing base (1c978c5) to head (3242fad).

Files with missing lines	Patch %	Lines
...ava/com/thealgorithms/sorts/AdaptiveMergeSort.java	0.00%	28 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5725      +/-   ##
============================================
- Coverage     62.98%   62.88%   -0.11%     
- Complexity     4049     4050       +1     
============================================
  Files           569      570       +1     
  Lines         16056    16084      +28     
  Branches       3086     3091       +5     
============================================
+ Hits          10113    10114       +1     
- Misses         5525     5553      +28     
+ Partials        418      417       -1     

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