add some docs to the top level README

examples/README.md

@@ -58,3 +58,14 @@ The plots are SVG files and are written in the `history` directory in a director
 ```shell
 open $(ls -d history/compute-* | tail -1)/timeline.svg
 ```
+
+## Running the notebook examples
+
+Before running these notebook examples, you will need to install some additional dependencies (besides Cubed).
+
+`mamba install rich pydot flox cubed-xarray`
+
+`cubed-xarray` is necessary to wrap Cubed arrays as Xarray DataArrays or Xarray Datasets.
+`flox` is for supporting more efficient Map Reduce.
+`pydot` allows plotting the Cubed execution plan.
+`rich` is for showing progress of array operations within callbacks applied to Cubed plan operations.