added links to dimension (#22)

Author: ginterloper

lib/design/dimensions.dart

@@ -77,3 +77,6 @@ const double fontSize15 = 15;
 const double fontSize17 = 17;
 const double fontSize24 = 24;
 const double fontSize40 = 40;
+
+const String connectionTgUrl = 't.me/vpn_client_bot';
+const String supportTgUrl = 't.me/vpn_client_support';