Add Black scholes

[triuyen]

Pull Request Template

Description

Please include a summary of the change and which issue (if any) is fixed.
A brief description of the algorithm and your implementation method can be helpful too. If the implemented method/algorithm is not so
well-known, it would be helpful to add a link to an article explaining it with more details.

Type of change

Please delete options that are not relevant.

• [V] New feature (non-breaking change which adds functionality)

Checklist:

• [V] I ran bellow commands using the latest version of rust nightly.
• [V] I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• [V] I ran cargo fmt just before my last commit.
• [V] I ran cargo test just before my last commit and all tests passed.
• [V] I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• [V] I added my algorithm to DIRECTORY.md with the correct link.
• [V] I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.62%. Comparing base (e753993) to head (6eda302).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #962      +/-   ##
==========================================
+ Coverage   95.57%   95.62%   +0.04%     
==========================================
  Files         337      338       +1     
  Lines       22015    22055      +40     
==========================================
+ Hits        21040    21089      +49     
+ Misses        975      966       -9     

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