NEW: Privacy Policy and TOS Popup

Frontend/lib/mih_components/mih_objects/user_consent.dart

@@ -0,0 +1,29 @@
+class UserConsent {
+  String app_id;
+  DateTime privacy_policy_accepted;
+  DateTime terms_of_services_accepted;
+
+  UserConsent({
+    required this.app_id,
+    required this.privacy_policy_accepted,
+    required this.terms_of_services_accepted,
+  });
+
+  factory UserConsent.fromJson(Map<String, dynamic> json) {
+    return UserConsent(
+      app_id: json['app_id'],
+      privacy_policy_accepted: DateTime.parse(json['privacy_policy_accepted']),
+      terms_of_services_accepted:
+          DateTime.parse(json['terms_of_services_accepted']),
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'app_id': app_id,
+      'privacy_policy_accepted': privacy_policy_accepted.toIso8601String(),
+      'terms_of_services_accepted':
+          terms_of_services_accepted.toIso8601String(),
+    };
+  }
+}