welcom page and home page init

lib/model/identifiers/enum/color.dart

@@ -0,0 +1,14 @@
+enum Color {
+  none,
+  red,
+  orange,
+  yellow,
+  green,
+  blue,
+  purple,
+  pink,
+  brown,
+  grey,
+  black,
+  white,
+}

lib/model/identifiers/enum/priority.dart

@@ -0,0 +1,7 @@
+enum Priority{
+  none,
+  low,
+  medium,
+  moderate,
+  high
+}

lib/model/identifiers/tag.dart

@@ -0,0 +1,6 @@
+import 'enum/color.dart';
+
+class Tag {
+  static String title = "";
+  Color color = Color.none;
+}