Add MF-10: Footnote stuff

MF-10%3A Footnote stuff.-.md

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+Here is a Markdown example that demonstrates how to create a footnote. Footnotes are another feature of Extended Markdown.
+
+***
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+This is some text that needs a citation. You can add a footnote like this[^1].
+
+You can also have another footnote right here[^2].
+
+...
+
+[^1]: This is the first footnote.
+[^2]: And this is the second footnote, providing more information.