New C# concept exercise: Stack

[sannae]

Hello!

As a total beginner, I first met the Stack<T> data structure in the exercise Matching Brackets: I was wondering I we could introduce it with an ad-hoc concept exercise in the C# path.

(Note: this issue is just a reminder, I will open a thread on the topic and discuss about it with the C# maintainers)

[github-actions]

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[ErikSchierboom]

Yep, this is a good idea.