Add example notebook

[SarahAlidoost]

Here, I added an example notebook that shows the complete workflow: model training, data processing and prediction.

[review-notebook-app]

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[SarahAlidoost]

@QianqianHan96 here I added an example notebook mainly to show how to optimize the emulator workflow using dask, dask-ml and xarray. There might be small differences in handling data for example, LAI interpolation using data from the previous year. I didn't run the example notebook on snellius with a large dataset. I created this pull request, just in case you would like to add the example to the repository.

[QianqianHan96]

Hi Sarah, thanks for adding the example notebook. I will have a look at it probably at the end of this month when I start producing fluxes dataset. Now I am still working on cleaning the training data.

I will let you know after I go through your optimized script.