title: Store image in string
body: <p>I have used an image in the form of links online.
  I want to use the image from assets.
  Is there any way ?</p>
  
  <pre><code> child: _boxes(
                "https://nepaldrives.com/wp-content/uploads/2019/10/ktmnewservicecenter3.jpg",
                27.7147, 85.3355,"KTM Service Center"),
                Widget _boxes(String _image, double lat,double long,String restaurantName)
  </code></pre>
  
  <p>I have used that image in this way</p>
  
  <pre><code> child: Image(
                            fit: BoxFit.fill,
                            image: NetworkImage(_image),
                          ),
  </code></pre>