Citation documentation per corpus

[lukavdplas]

Is your feature request related to a problem? Please describe.
Since I-analyzer aims to be accessible to researchers with any experience level, and presents a wide variety of media in the different corpora, users may be uncertain about how to cite documents. So the flow from seeing something in I-analyzer and bringing it up involves an extra step where you consult external sources.

I think I-analyzer has the potential to be a powerful help in making students and researchers aware of how to reference digital media, which is in line with our mission as digital humanists.

Describe the solution you'd like
Write a brief (markdown) documentation page per corpus that gives examples for, say, APA, MLA and bibtex.

Additional context
This is a dressed-down version of #726 : add documentation about citation to corpora, without generating citations for documents. This is trivial on a technical level, and the research effort would also be a necessary preparation of #726.

[lukavdplas]

Adding citation documentation is now possible!

The DBNL and Troonredes corpora have citation documentation, but I want to add citation docs to a few more corpora before I close the issue. For example:

• Times
• Delpher
• Dutch parliamentary debates