replace CLI with modern dark-mode Tkinter interface

Swapped the old text-only menu for a polished window:

Author: xry1ch

README.md

@@ -1,4 +1,4 @@
-# 🔏 Criptify
+![banner](./media/banner.png)
 
 [![MIT License](https://img.shields.io/badge/license-MIT-green.svg)](https://opensource.org/licenses/MIT)
 ![Python Version](https://img.shields.io/badge/python-3.6%20%7C%203.7%20%7C%203.8%20%7C%203.9%20%7C%203.10-blue)
@@ -9,13 +9,13 @@ Criptify is a Python script that uses the Fernet encryption algorithm from the c
 
 ## 📋 Features
 
-- Easy to use command line interface
+- Easy to use modern GUI
 - Generate a random Fernet key or use your own
 - Encrypt and decrypt multiple files at once
 
 ## 📥 Installation
 
 - Download the latest release of the program from the [release](https://github.com/Wrynch/Criptify/releases/latest) page.
 - Unzip the downloaded file to a directory of your choice.
-- Run the install.bat script to install the required dependencies. If you encounter any issues, you may need to manually install tk and cryptography with your package manager.
+- Run the install.bat script to install the required dependencies.
 - To use the program, run the launch.bat script. This will open a command prompt where you can enter commands to encrypt or decrypt files.