Add profile images to chats

lib/room.dart

@@ -50,10 +50,20 @@ class _RoomPageState extends State<RoomPage> {
             itemCount: timeline?.events.length,
             reverse: true,
             itemBuilder: (context, index) => ListTile(
-                  title: Text(timeline!.events[index].senderFromMemoryOrFallback
-                          .displayName ??
-                      ""),
+                  title: Text(timeline!
+                      .events[index].senderFromMemoryOrFallback.displayName
+                      .toString()),
                   subtitle: Text(timeline!.events[index].body),
+                  leading: timeline?.events[index].senderFromMemoryOrFallback
+                              .avatarUrl !=
+                          null
+                      ? CircleAvatar(
+                          foregroundImage: NetworkImage(timeline!.events[index]
+                              .senderFromMemoryOrFallback.avatarUrl!
+                              .getThumbnail(widget.room.client,
+                                  width: 50, height: 50)
+                              .toString()))
+                      : null,
                 )),
       ),
       TextFormField(