Add a page for cool research projects 'built with OpenML'

[joaquinvanschoren]

The idea is to have an overview list of interesting papers that build on OpenML.
We could start a seed list, and then allow authors to add their papers via pull requests.

Every paper could have title, authors, abstract, and link to the paper.
Optionally, they could also point to datasets or runs used in the paper, e.g via a tag or study.