Add python environments & corn to cookbook

[jules32]

Related to #190

Add section about python environments for development in our cookbook:

@andypbarrett during coworking, with @michele-personal :

"This is the way NSIDC developers work, it saves headaches from conda installs. Here's a environment.yml that will spin up earthaccess and xarray. You run it with:"

$ conda env create -f environment.yml

This is the environment.yml

name: test_earthaccess
channels:
 - conda-forge
 - default
dependencies:
 - python==3.10
​
  ################################################################
  # Imported dependencies and extensions (and related typestubs) #
  ################################################################
​
 - jupyterlab
 - earthaccess
 - xarray
 - dask
 - netCDF4
 - bottleneck
 - matplotlib
 - cartopy
 - ```

[jules32]

We've created a high-level chapter to describe environments, including Corn

#186