Working on sidebar menu UI.

src/main/java/org/to/telegramfinalproject/UI/SidebarMenuController.java

@@ -0,0 +1,31 @@
+package org.to.telegramfinalproject.UI;
+
+import javafx.fxml.FXML;
+import javafx.scene.control.*;
+import javafx.scene.image.Image;
+import javafx.scene.image.ImageView;
+
+public class  SidebarMenuController {
+    @FXML private ImageView profileImage;
+    @FXML private Label usernameLabel;
+
+    @FXML private Button myProfileButton;
+    @FXML private Button newGroupButton;
+    @FXML private Button newChannelButton;
+    @FXML private Button contactsButton;
+    @FXML private Button savedMessagesButton;
+    @FXML private Button settingsButton;
+    @FXML private Button telegramFeaturesButton;
+    @FXML private Button telegramQnAButton;
+
+    @FXML private ToggleButton nightModeToggle;
+
+    @FXML
+    public void initialize() {
+        Image image = new Image(getClass().getResource("/org/to/telegramfinalproject/Images/profile.png").toExternalForm());
+        profileImage.setImage(image);
+
+        // Called automatically after FXML is loaded
+        usernameLabel.setText("Asal");
+    }
+}

src/main/java/org/to/telegramfinalproject/UI/TelegramApplication.java

@@ -14,6 +14,9 @@ public class TelegramApplication extends Application {
     public void start(Stage stage) throws IOException {
         FXMLLoader fxmlLoader = new FXMLLoader(TelegramApplication.class.getResource("/org/to/telegramfinalproject/sidebar_menu.fxml"));
         Scene scene = new Scene(fxmlLoader.load(), 1480, 820);
+
+        scene.getStylesheets().add(getClass().getResource("/org/to/telegramfinalproject/CSS/sidebar_menu.css").toExternalForm());
+
         stage.setTitle("Telegram");
         stage.setScene(scene);
         stage.show();