Add react_gemini_prompting.ipynb (google#255)

* Add react_gemini_prompting.ipynb

* format with nbfmt

* Add Wikipedia content licensing information

* nbfmt format

* Fix broken url

* Update react_gemini_prompting.ipynb

* Update react_gemini_prompting.ipynb

* Fix styling

* Fix double license.

* Update react_gemini_prompting.ipynb

Remove @title

* Fix Note.

* Add info about licensing of prompt and in-context examples

* format

* Pr255 (#1)

* Some fixes + add outputs

* add example

* Add outputs and format

* Update wikipedia note

* Nits: Fix case, indent and heading verb

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Co-authored-by: Mark Daoust <markdaoust@google.com>
Co-authored-by: Mark McDonald <macd@google.com>