feat: added TwoSat solutions with Tests, also updated Directory.md

[Shoyeb45]

• 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

Related to

Closes #6730

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.19178% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.21%. Comparing base (74ddea6) to head (e276f63).

Files with missing lines	Patch %	Lines
...om/thealgorithms/datastructures/graphs/TwoSat.java	82.19%	6 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6756   +/-   ##
=========================================
  Coverage     77.20%   77.21%           
- Complexity     6119     6141   +22     
=========================================
  Files           719      720    +1     
  Lines         20452    20525   +73     
  Branches       3956     3973   +17     
=========================================
+ Hits          15790    15848   +58     
- Misses         4062     4069    +7     
- Partials        600      608    +8     

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[alxkm]

Looks good. Thank you for the contribution.