feat[NavigationController]: Add a small about us pop up feature that …

…summarizes what this application is about

src/main/java/edu/group5/app/App.java

@@ -82,7 +82,7 @@ public void init() {
     OrganizationService organizationService = new OrganizationService(organizationRepository, orgScraper);
     this.root = new BorderPane();
     this.appState = new AppState();
-    this.nav = new NavigationController(root, appState, userService, donationService, organizationService);
+    this.nav = new NavigationController(root, appState, userService, donationService, organizationService, getHostServices());
   }
 
   @Override

src/main/java/edu/group5/app/control/NavigationController.java

@@ -15,7 +15,13 @@
 import edu.group5.app.view.loginpage.SignUpPageView;
 import edu.group5.app.view.organizationpage.OrganizationPageView;
 import edu.group5.app.view.userpage.UserPageView;
+import javafx.application.HostServices;
+import javafx.scene.control.Alert;
+import javafx.scene.control.ButtonType;
+import javafx.scene.control.Hyperlink;
+import javafx.scene.control.Label;
 import javafx.scene.layout.BorderPane;
+import javafx.scene.layout.VBox;
 
 /**
  * Controller responsible for handling navigation between different pages of the application.
@@ -33,23 +39,25 @@ public class NavigationController {
   private final LoginHeader loginHeader;
 
   private final AppState appState;
+  private HostServices hostServices;
 
   private final AuthController authController;
   private final DonationController donationController;
   private final OrganizationController organizationController;
 
   public NavigationController(BorderPane root, AppState appState, UserService userService, 
-    DonationService donationService, OrganizationService organizationService) {
+    DonationService donationService, OrganizationService organizationService, HostServices hostServices) {
     ParameterValidator.objectChecker(root, "Root BorderPane");
     ParameterValidator.objectChecker(appState, "AppState");
     ParameterValidator.objectChecker(userService, "UserService");
     ParameterValidator.objectChecker(donationService, "DonationService");
     ParameterValidator.objectChecker(organizationService, "OrganizationService");
+    ParameterValidator.objectChecker(hostServices, "HostServices");
 
     this.root = root;
     this.header = new Header(this);
     this.loginHeader = new LoginHeader();
-
+    this.hostServices = hostServices;
     this.appState = appState;
 
     this.authController = new AuthController(appState, this, userService);
@@ -122,7 +130,31 @@ public void showDonationPage() {
   }
 
   public void showAboutUsPage() {
-    root.setTop(header);
+    Alert aboutUs = new Alert(Alert.AlertType.INFORMATION);
+    aboutUs.setTitle("About us");
+    aboutUs.setHeaderText("Help Me Help - About Us");
+
+    Label description = new Label(
+        "Help Me Help is a charity donation application designed to connect donors with organizations in need. " +
+        "Our mission is to make it easy for people to support causes they care about and make a positive impact in the world.\n\n" +
+        "This application was developed by Team 5 as part of a IDATT1005 course project at NTNU spring 2026."
+    );
+    description.setWrapText(true);
+    description.maxWidthProperty().bind(aboutUs.getDialogPane().widthProperty().subtract(40));
+
+    Hyperlink websiteLink = new Hyperlink("For more information about the project, visit our GitHub repository");
+    websiteLink.setOnAction(e -> hostServices.showDocument("https://git.ntnu.no/Group-5/Help-Me-Help"));
+
+    VBox content = new VBox(10, description, websiteLink); 
+    content.setPrefWidth(420);
+
+    aboutUs.getDialogPane().setContentText(null); 
+    aboutUs.getDialogPane().setContent(content);
+
+    // Optional: single Close button instead of OK
+    aboutUs.getButtonTypes().setAll(ButtonType.CLOSE);
+
+    aboutUs.showAndWait();
   }
 
   /**