Add provider dependency

pubspec.lock

@@ -207,6 +207,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.7.0"
+  nested:
+    dependency: transitive
+    description:
+      name: nested
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   package_config:
     dependency: transitive
     description:
@@ -221,6 +228,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  provider:
+    dependency: "direct main"
+    description:
+      name: provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.2"
   pub_semver:
     dependency: transitive
     description:
@@ -305,3 +319,4 @@ packages:
     version: "3.1.0"
 sdks:
   dart: ">=2.16.1 <3.0.0"
+  flutter: ">=1.16.0"

pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   flutter:
     sdk: flutter
   http: ^0.13.4
+  provider: ^6.0.2
 dev_dependencies:
   flutter_test:
     sdk: flutter