Add workflow to add DIRECTORY.md with...

[Panquesito7]

...list of all files/algorithms.
Taken and slightly modified from the C++ repository.

No need to list new algorithms on the README.md.
They'll be added automatically into the DIRECTORY.md file. 🙂

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• [ ] I have added comments to hard-to-understand areas of my code
• [ ] 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
• [ ] I have made corresponding changes to the comments
• [ ] I have made corresponding changes to the README.md

[codecov]

Codecov Report

Merging #202 (e02ea51) into master (8739f90) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #202   +/-   ##
=======================================
  Coverage   92.64%   92.64%           
=======================================
  Files          98       98           
  Lines        4444     4444           
=======================================
  Hits         4117     4117           
  Misses        327      327           

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[ayaankhan98]

👍