Write the "Associated Items" Concept

[0xNeshi]

Official docs:
https://book.cairo-lang.org/ch11-10-associated-items.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