Add minimal pymc example

[HarshvirSandhu]

Description

Example is taken from this notebook and made to look like the readme example of sunode Not sure if the example is placed correctly.

Related Issue

• [x] Closes #7267

Checklist

• [x] Checked that the pre-commit linting/style checks pass
• [x] Added necessary documentation (docstrings and/or example notebooks)

Type of change

• [x] Documentation

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📚 Documentation preview 📚: https://pymc--7281.org.readthedocs.build/en/7281/

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[kirahowe]

Having a look at this at the PyData London 2024 hackathon 😄

[kirahowe]

Couldn't commit to this branch, so there's a PR here on another fork: https://github.com/pymc-devs/pymc/pull/7358. As of today, the example works on my machine and the outputs reflect the names used in the example.

[twiecki]

Closing in favor of #7358.