Update README with instructions on accessing example notebooks

[lbianchi-lbl]

Addresses issue:

Summary/Motivation:

Changes proposed in this PR:

-

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1. I agree my contributions are submitted under the license terms described in the LICENSE.md and COPYRIGHT.md file at the top level of this directory.
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[codecov[bot]]

Codecov Report

Merging #133 (7b472c6) into main (5760166) will not change coverage. The diff coverage is n/a.

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  Files          57       57           
  Lines        6105     6105           
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  Hits         5696     5696           
  Misses        409      409           

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[Xinhe-Chen]

Hi Ludovico, I think the ReadMe is very clear and straightforward.