project dependencies are missing xarray and netcdf4

[scottcha]

When following sample instructions you will get errors for missing xarray and netcdf4 dependencies.

Repro steps:

1. Create a clean repo
2. Install via pip
3. Follow steps in example: https://github.com/microsoft/aurora/blob/main/docs/example.ipynb

expected result:
Example works

actual result:
you will first get an error for a missing xarray dependency, after fulfilling that you will then get an error for a missing netcdf4 dependency.

[wesselb]

Hey @scottcha! Thanks for noticing this.

You're right that the notebook requires additional packages. I will clarify that in the notebook. :)