Add lake.jpg.

Note that wget doesn’t work for saving this binary file.
  The original image is available online under a
  Creative Commons license, but it’s large and slow to fetch.

Update the pubspec.yaml file to include an assets tag.
This makes the image available to your code.

    
    
    
    
    
        
        {step4 → step5}/pubspec.yaml
    

    
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        @@ -18,3 +18,5 @@
    


    
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            flutter:
        
    


    
      19
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              uses-material-design: true