Layout created for single screen app (#2)

lib/Utils/Constants.dart

@@ -0,0 +1,9 @@
+import 'package:flutter/cupertino.dart';
+
+const Color colourOne = Color(0xFF253031);
+const Color colourTwo = Color(0xFF315659);
+const Color colourThree = Color(0xFF2978A0);
+const Color colourFour = Color(0xFF8549ff);
+const Color colourFive = Color(0xFFC6E0FF);
+
+const double PADDING_GLOBAL = 12;

lib/Utils/ViewState.dart

@@ -0,0 +1,20 @@
+import 'package:sealed_annotations/sealed_annotations.dart';
+
+@Sealed()
+abstract class ViewState {}
+
+class Idle implements ViewState {}
+
+class HasStarted implements ViewState {}
+
+class HasData implements ViewState {
+  final dynamic data;
+
+  HasData(this.data);
+}
+
+class HasError implements ViewState {
+  final String error;
+
+  HasError(this.error);
+}

lib/Utils/ViewUtils.dart

@@ -0,0 +1,18 @@
+import 'package:flutter/cupertino.dart';
+import 'package:toast/toast.dart';
+
+class ViewUtils{
+
+  static displayToast(BuildContext context, String message){
+    Toast.show(
+        message,
+        duration: Toast.lengthLong,
+        gravity:  Toast.bottom
+    );
+  }
+
+  static displayToastDeferred(BuildContext context, String message){
+    WidgetsBinding.instance.addPostFrameCallback(
+            (_) => displayToast(context, message));
+  }
+}