Add Valid Parentheses Checker algorithm

[Jccqt]

Summary of the Change:

This pull request introduces the Valid Parentheses Checker, which checks whether the given parentheses are valid. A valid parentheses should have opening braces and closing braces.

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[codecov]

Codecov Report

Attention: Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Project coverage is 95.15%. Comparing base (8fec042) to head (bc160b4).

Files with missing lines	Patch %	Lines
Algorithms/Strings/ValidParentheses.cs	86.20%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #510      +/-   ##
==========================================
- Coverage   95.18%   95.15%   -0.03%     
==========================================
  Files         269      270       +1     
  Lines       10894    10923      +29     
  Branches     1531     1537       +6     
==========================================
+ Hits        10369    10394      +25     
- Misses        400      403       +3     
- Partials      125      126       +1     

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