Add Android flavors.

android/app/build.gradle

@@ -48,6 +48,21 @@ android {
             signingConfig signingConfigs.debug
         }
     }
+
+    flavorDimensions "flavor-type"
+
+    productFlavors {
+        development {
+            dimension "flavor-type"
+            applicationIdSuffix ".dev"
+            versionNameSuffix "-dev"
+            manifestPlaceholders = [appLabel:"Vereign-dev"]
+        }
+        production {
+            dimension "flavor-type"
+            manifestPlaceholders = [appLabel:"Vereign"]
+        }
+    }
 }
 
 flutter {

android/app/src/main/AndroidManifest.xml

@@ -11,7 +11,7 @@
          FlutterApplication and put your custom class here. -->
     <application
         android:name="io.flutter.app.FlutterApplication"
-        android:label="Vereign"
+        android:label="${appLabel}"
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name=".MainActivity"