Update README.md to add citation information (#2969)
Update README.md to add citation information (#2969)

* Update README.md

Add citation request, please feel free to change it. People struggle to find the citation, as in e.g. https://arxiv.org/pdf/2012.11896

* Update README.md

Add link to arxiv and add bibtex so that people don't just use the arxiv bibtex
common-voice/common-voice,common-voice/common-voice,common-voice/common-voice,common-voice/common-voice