TheAlgorithms/C-Sharp ? reverse-engineered prompt

Build me a C# algorithms and data structures library for learning and reference.

I want a clean repo with lots of small, well named implementations for common topics like sorting, searching, graphs, math, strings, compression, crypto style helpers, and basic machine learning examples. Each algorithm should be easy to read, have comments where needed, and include simple tests so I can trust it works. If there are multiple ways to solve the same problem, include a straightforward version and a more efficient one when it makes sense.

Keep it organized so someone browsing the project can quickly find what they need, and make the code style consistent across the whole repo. Add short README notes or usage examples for the main algorithms so it feels like a learning resource, not just a pile of code. If you need to check current docs or best practices online while setting it up, go ahead and do that.