Matching topics

[valerievossen]

Dear @kleintob,

The matching topics are done :) I divided them into two topics:

• The first topic introducing the matching method with a very simple example of exact matching to understand the intuition.
• The second topic focusses on Propensity score matching and contains your example.

Let me know what you think, whether I am missing anything important or any feedback you have! When it is merged, I will double-check whether everything went well with the images as I can't see them when running locally. Thank you!!

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[valerievossen]

Thank you @kleintob, the changes are made. @lachlandeer, this PR is now ready to merge!

[lachlandeer]

Looks great -- thanks for this!