Frontend first draft

frontend/pweb/lib/config/constants.dart

@@ -0,0 +1,10 @@
+class Constants {
+  static const minPasswordCharacters = 8;
+}
+
+class AppConfig {
+  static const String appName = String.fromEnvironment(
+    'APP_NAME',
+    defaultValue: 'SendiCo',
+  );
+}