Update constants with new colours

MainAppDMT/lib/constants.dart

+import 'package:flutter/material.dart';
+
+// list of colors that we use in our app
+const kBackgroundColor = Color(0xFFF1EFF1);
+const kPrimaryColor = Color(0xFF035AA6);
+const kSecondaryColor = Color(0xFFFFA41B);
+const kTextColor = Color(0xFF000839);
+const kTextLightColor = Color(0xFF747474);
+const kBlueColor = Color(0xFF40BAD5);
+
+const kDefaultPadding = 20.0;
+
+// our default Shadow
+const kDefaultShadow = BoxShadow(
+  offset: Offset(0, 15),
+  blurRadius: 27,
+  color: Colors.black12, // Black color with 12% opacity
+);