Add Timer context manager class

Week06/timer_sekip_yaman_arslan.py

@@ -0,0 +1,20 @@
+import time
+
+
+class Timer:
+    """
+    A context manager class that measures the time taken
+    by the block of code it manages.
+    """
+
+    def __init__(self):
+        self.start_time = None
+        self.end_time = None
+
+    def __enter__(self):
+        self.start_time = time.time()
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        self.end_time = time.time()
+        return False