Add notebook illustrating how to connect Langchain to Oracle 26ai

[svpino]

No description provided.

[oracle-contributor-agreement]

Thank you for your pull request and welcome to our community! To contribute, please sign the Oracle Contributor Agreement (OCA).
The following contributors of this PR have not signed the OCA:

• PR author: svpino
• svpino@gmail.com (@svpino)

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[jasperan]

hey @svpino could you please look at the mention above and sign the Contributor Agreement please?

Thank you for your pull request and welcome to our community! To contribute, please sign the Oracle Contributor Agreement (OCA). The following contributors of this PR have not signed the OCA:

* PR author: svpino * [svpino@gmail.com](mailto:svpino@gmail.com) (@svpino) 

To sign the OCA, please create an Oracle account and sign the OCA in Oracle's Contributor Agreement Application.

When signing the OCA, please provide your GitHub username. After signing the OCA and getting an OCA approval from Oracle, this PR will be automatically updated.

If you are an Oracle employee, please make sure that you are a member of the main Oracle GitHub organization, and your membership in this organization is public.

[svpino]

This should be good to go.

hey @svpino could you please look at the mention above and sign the Contributor Agreement please?