Add performance decorator

Week04/decorators_busra_pehlivanlar.py

@@ -0,0 +1,21 @@
+import time
+import sys
+
+def performance(func):
+    def wrapper(*args, **kwargs):
+        start_t = time.perf_counter()
+
+        result = func(*args, **kwargs)
+
+        end_t = time.perf_counter()
+
+        performance.counter += 1
+        performance.total_time += (end_t - start_t)
+        performance.total_mem += sys.getsizeof(result)
+
+        return result
+    return wrapper
+
+performance.counter = 0
+performance.total_time = 0.0
+performance.total_mem = 0