Add Timer class with context manager support

Implement a Timer class for measuring elapsed time.

Author: Ebrukoksal

Week06/timer_ebru_koksal.py

@@ -0,0 +1,13 @@
+import time
+
+class Timer:
+  def __init__(self):
+    self.start_time = 0
+    self.end_time = 0
+
+  def __enter__(self):
+    self.start_time = time.time()
+    return self
+
+  def __exit__(self, exc_type, exc_value, traceback):
+    self.end_time = time.time()