first notebooks for NE processing

[e-maud]

• [x] create subfolder for NE processing @EmanuelaBoros
• [x] sketch first notebook for NER @EmanuelaBoros
• [x] code to convert NER output to EL input @EmanuelaBoros
• [ ] test and complement document @piconti @e-maud
• [ ] test if everything works well @danieleguido

[EmanuelaBoros]

Hello @e-maud and @piconti,

The notebooks are in the first-notebooks-for-ne-processing branch, in the entities folder.

Let me know how it goes!

[EmanuelaBoros]

Hello @danieleguido, I made a PR so we can progress a bit more and fast.