Data Structures: Stack & Queue

[fabiancannaheim]

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Did you read the instructions in the README?

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Have you read the instructions in CONTRIBUTING?

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Have you written this article by yourself? Have you taken inspiration from anywhere and then written it in your words?

These articles are written in my own words but inspired by a university module in Algorithms & Data Structures I visited a year ago. I thought it would be a good idea to open a new folder "DataStructures" and also think about to open one for "Algorithms".

Individual note

This is my first pull request to a foreign repository outside of the university environment. I hope I made everything correct. Otherwise I would be glad for feedback! Thank you!