Created project base structure, state management, router and login

lib/constants/colors.dart

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+import 'package:flutter/material.dart';
+
+import 'package:my_linkding/constants/linkding_color.dart';
+
+const List<MaterialColor> colors = [
+  linkdingColor,
+  Colors.red,
+  Colors.green,
+  Colors.blue,
+  Colors.yellow,
+  Colors.orange,
+  Colors.brown,
+  Colors.cyan,
+  Colors.purple,
+  Colors.pink,
+  Colors.deepOrange,
+  Colors.indigo,
+];