Added Bicycle class to repository

Bicycle.py

@@ -0,0 +1,18 @@
+from Vehicle import Vehicle
+
+class Bicycle(Vehicle):
+    def __init__(self, brand, model, year, gear_count):
+        super().__init__(brand, model, year)
+        self.gear_count = gear_count
+
+    def display_info(self):
+        """Override the parent class method for a Bicycle."""
+        return f"Bicycle: {self._brand} {self._model}, Gears: {self.gear_count} ({self._year})"
+
+    def ring_bell(self):
+        """Specific implementation for a bicycle."""
+        return "Ring ring!"
+
+    def pedal(self):
+        """Simulate pedaling the bicycle."""
+        return "Keep pedaling! You rock!!"

Vehicle.py

@@ -17,3 +17,6 @@ def fuel_up(self):
 
     def brake(self):
         print("Braking the car.")
+
+    def check_maintenance(self):
+        return f"{self._brand} {self._model} needs a checkup soon!"