Write the "Control Flow" concept

[0xNeshi]

Official docs: https://book.cairo-lang.org/ch02-05-control-flow.html https://book.cairo-lang.org/ch06-03-concise-control-flow-with-if-let-and-while-let.html

The idea is to have a short and to-the-point article about the concept. Avoid copy/pasting everything from The Cairo Book; the Book should be used as a more in-depth learning resource for students after they finish the concept on Exercism (or they can use it in parallel).

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Exercism Concepts docs: https://exercism.org/docs/building/tracks/concepts

Use the following Rust's concept as inspiration for the format: https://github.com/exercism/rust/blob/main/concepts/structs/about.md

[Falilah]

can I take this?

[0xNeshi]

Of course!