Added the provider package and created a User model

Author: Julian Currie

lib/model/user.dart

@@ -0,0 +1,4 @@
+class User {
+  String name;
+  int age;
+}

pubspec.lock

@@ -81,13 +81,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0-nullsafety.3"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0-nullsafety.1"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.3.3"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -151,3 +165,4 @@ packages:
     version: "2.1.0-nullsafety.3"
 sdks:
   dart: ">=2.10.0-110 <2.11.0"
+  flutter: ">=1.16.0 <2.0.0"

pubspec.yaml

@@ -19,6 +19,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  provider: ^4.3.3
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.