adding the fibonacci series to the Recursion package

[MohamedBoukthir]

• 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 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 73.46%. Comparing base (df0c997) to head (123f683).

Files with missing lines	Patch %	Lines
...a/com/thealgorithms/Recursion/FibonacciSeries.java	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6079   +/-   ##
=========================================
  Coverage     73.46%   73.46%           
- Complexity     5096     5099    +3     
=========================================
  Files           657      658    +1     
  Lines         17632    17637    +5     
  Branches       3394     3394           
=========================================
+ Hits          12953    12957    +4     
- Misses         4176     4178    +2     
+ Partials        503      502    -1     

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[siriak]

Please add JUnit tests, remove main, and fix PR checks

[siriak]

Looks good, thanks!