extract sorted by frequency with mapping to SKOS

Resource	Count	SKOS mapping
<https://gitter.im/linkedresearch/chat>	1
<https://gitter.im/solid/chat>	1
<http://crosscloud.org/>	1
<https://linkedresearch.org/>	1
<https://solid.mit.edu/>	1
<https://github.com/solid/solid/issues>	1