title: add a subtitle in my flutter code
body: <p>I have this flutter code :</p>
  
  <pre><code>body: StreamBuilder(
            stream: Firestore.instance.collection('Doctors').snapshots(),
            builder:
                (BuildContext context, AsyncSnapshot&lt;QuerySnapshot&gt; snapshot) {
              if (!snapshot.hasData)
                return const Center(child: CircularProgressIndicator());
              return ListView(
                padding: const EdgeInsets.only(top: 8.0),
                children:
                snapshot.data.documents.map((DocumentSnapshot document) {
                  return new Card(
                    child: new Container(
                      padding: EdgeInsets.all(10.0),
                      child: new Row(
                        mainAxisAlignment: MainAxisAlignment.start,
                        children: &lt;Widget&gt;[
                          CircleAvatar(
                            backgroundColor: Colors.grey,
                            backgroundImage:
                            new NetworkImage("${document['Picture']}"),
                            radius: 40.0,
                          ),
                          SizedBox(width: 10.0,
                          ),
                          Text(
                            document['Name'],
                          )
                        ],
                      ),
                    ),
                  );
                }).toList(),
              );
            },
          ),
        ),
  </code></pre>
  
  <p>and I need to insert another text as a subtitle under the text connected to Text(document['Name'],) but i cant do so, can you help me please</p>