feat: Implement interactive shortcut selection

This commit enhances your experience for setting a keyboard shortcut. Instead of typing the shortcut as a string, you are now prompted to press the desired key combination directly.

The `src/config.py` module has been updated to:
- Use `keyboard.read_hotkey()` to capture the key combination you press.
- Display the captured shortcut for confirmation.
- Save the shortcut only after you confirm it is correct.

This provides a more intuitive and less error-prone way for you to configure your preferred shortcut.

src/config.py

@@ -0,0 +1,26 @@
+import os
+import keyboard
+
+CONFIG_FILE = "shortcut.txt"
+
+def get_shortcut():
+    """
+    Retrieves the shortcut from the config file.
+    If the file doesn't exist, it prompts the user to create one by pressing the desired keys.
+    """
+    if not os.path.exists(CONFIG_FILE):
+        print("It seems this is the first time you are running the application.")
+        while True:
+            print("Please press the key combination you want to use as a shortcut and then press ESC.")
+            shortcut = keyboard.read_hotkey(suppress=False)
+            print(f"You pressed: {shortcut}")
+            confirm = input("Is this correct? (y/n): ").lower()
+            if confirm == 'y':
+                with open(CONFIG_FILE, "w") as f:
+                    f.write(shortcut)
+                return shortcut
+            else:
+                print("Let's try again.")
+    else:
+        with open(CONFIG_FILE, "r") as f:
+            return f.read().strip()