Create PotentialsRE.md

[LippkauFelix]

RE Potentials for the restrictions page.

[olejandro]

Cool! @LippkauFelix I've approved this PR, so you can merge any time. I've suggested changes that you can just accept, if you agree. They relate to:

• Headings. There has to be a space between the last hash and the title for it to be recognised as a heading.
• Paragraphs. There needs to be a blank line for text to be recognised as a paragraph.

I would also use only lower case for file names, e.g. potentials-re.md or renewable-potentials.md. Here you can see how the added page is rendered (this will update if you make further changes): https://etsap-tiam--10.org.readthedocs.build/en/10/restrictions/PotentialsRE.html I believe a hyperlink will also appear on the restrictions page, once the headings are recognised.

[olejandro]

Actually, should we find an easier way to include tables? E.g. based on data in a *.csv file...