How To Create Circle Avatar With Gradient background In Flutter

flutter: 
  assets: 
   - assets/images/

Center(
    child: Container(
      decoration: BoxDecoration(
          gradient: LinearGradient(
              begin: Alignment.topLeft,
              end: Alignment.bottomRight,
              colors: [Colors.blue[500], Colors.blue[300]])),
      child:  Column(
        crossAxisAlignment: CrossAxisAlignment.center,
        children: <Widget>[
          SizedBox(height: 80,),
          Padding(
            padding: EdgeInsets.all(20),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.center,
              children: <Widget>[
                CircleAvatar(
                  backgroundImage: AssetImage("assets/images/logo.jpg"),
                  radius: 80.0,
                ),
                SizedBox(height: 20,),
                Text("Welcome Bajarangisoft", style: TextStyle(color: Colors.white, fontSize: 22),),
              ],
            ),
          ),
          SizedBox(height: 5),
          Expanded(
            child: Container(
              child: SingleChildScrollView(
                child: Padding(
                  padding: EdgeInsets.all(20),
                  child: Column(
                    children: <Widget>[
                      Container(
                        child: Column(
                          children: <Widget>[
                            Container(
                              child: Text("Lorem Ipsum is simply dummy text of the printing and typesetting industry."
                                  " Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, "
                                  "when an unknown printer took a galley of type and scrambled it to make a type specimen book."
                                  "The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.",
                              style: TextStyle(color: Colors.white),
                              )
                            ),
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          )
        ],
      ),
    ))

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Center(
            child: Container(
              decoration: BoxDecoration(
                  gradient: LinearGradient(
                      begin: Alignment.topLeft,
                      end: Alignment.bottomRight,
                      colors: [Colors.blue[500], Colors.blue[300]])),
              child:  Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  SizedBox(height: 80,),
                  Padding(
                    padding: EdgeInsets.all(20),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: <Widget>[
                        CircleAvatar(
                          backgroundImage: AssetImage("assets/images/logo.jpg"),
                          radius: 80.0,
                        ),
                        SizedBox(height: 20,),
                        Text("Welcome Bajarangisoft", style: TextStyle(color: Colors.white, fontSize: 22),),
                      ],
                    ),
                  ),
                  SizedBox(height: 5),
                  Expanded(
                    child: Container(
                      child: SingleChildScrollView(
                        child: Padding(
                          padding: EdgeInsets.all(20),
                          child: Column(
                            children: <Widget>[
                              Container(
                                child: Column(
                                  children: <Widget>[
                                    Container(
                                      child: Text("Lorem Ipsum is simply dummy text of the printing and typesetting industry."
                                          " Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, "
                                          "when an unknown printer took a galley of type and scrambled it to make a type specimen book."
                                          "The standard chunk of Lorem Ipsum used since the 1500s is reproduced below for those interested.",
                                      style: TextStyle(color: Colors.white),
                                      )
                                    ),
                                  ],
                                ),
                              ),
                            ],
                          ),
                        ),
                      ),
                    ),
                  )
                ],
              ),
            )));
  }
}