Implemented app.py for a better UX

Author: ashmod

app.py

@@ -0,0 +1,55 @@
+import sys
+from colorama import init, Fore, Style
+from main import launch_gui, launch_cli
+
+# Initialize colorama
+init(autoreset=True)
+
+def print_help():
+    help_text = f"""
+{Fore.YELLOW}{"Nodescope: An XML Editor and Visualizer".center(60)}{Style.RESET_ALL}
+
+{Fore.CYAN}Usage:{Style.RESET_ALL}
+    Select the desired mode by entering the corresponding number.
+
+{Fore.CYAN}Modes:{Style.RESET_ALL}
+    {Fore.GREEN}1.{Style.RESET_ALL} GUI  - Launch the graphical user interface.
+    {Fore.GREEN}2.{Style.RESET_ALL} CLI  - Launch the command-line interface.
+    {Fore.GREEN}3.{Style.RESET_ALL} Help - Show this help information.
+    {Fore.GREEN}4.{Style.RESET_ALL} Exit - Exit the application.
+
+{Fore.CYAN}Instructions:{Style.RESET_ALL}
+    - Enter the number corresponding to your choice and press Enter.
+    - For example, enter '1' to launch the GUI.
+"""
+    print(help_text)
+
+def app():
+    print_help()
+    
+    while True:
+        try:
+            choice = input(f"{Fore.GREEN}Enter your choice (1/2/3/4): {Style.RESET_ALL}").strip()
+            if choice == '1':
+                print(f"{Fore.BLUE}Launching GUI...{Style.RESET_ALL}")
+                launch_gui()
+                break  # Exit after launching GUI
+            elif choice == '2':
+                print(f"{Fore.BLUE}Launching CLI...{Style.RESET_ALL}")
+                launch_cli()
+                break  # Exit after launching CLI
+            elif choice == '3':
+                print_help()
+            elif choice == '4':
+                print(f"{Fore.LIGHTRED_EX}Exiting application. Goodbye!{Style.RESET_ALL}")
+                sys.exit(0)
+            else:
+                print(f"{Fore.RED}Invalid choice. Please enter 1, 2, 3, or 4.{Style.RESET_ALL}")
+        except KeyboardInterrupt:
+            print(f"\n{Fore.LIGHTRED_EX}Exiting application. Goodbye!{Style.RESET_ALL}")
+            sys.exit(0)
+        except Exception as e:
+            print(f"{Fore.RED}An unexpected error occurred: {e}{Style.RESET_ALL}")
+
+if __name__ == "__main__":
+    app()