added data cleaning example (xarray-contrib#121)

* added data cleaning example
* Add files via upload

Co-authored-by: dcherian <[email protected]>

Author: e-marshall

_toc.yml

@@ -37,6 +37,7 @@ parts:
       - file: intermediate/xarray_and_dask
       - file: intermediate/xarray_ecosystem
       - file: intermediate/hvplot
+      - file: data_cleaning/ice_velocity.ipynb
 
   - caption: Advanced
     chapters: