Add performance decorator for function metrics

Implement a performance decorator to measure execution time and memory usage.

Author: mehmetusta03

Week04/decorators_mehmet_usta.py

@@ -0,0 +1,23 @@
+def performance(func):
+    if not hasattr(performance, "counter"):
+        performance.counter = 0
+        performance.total_time = 0.0
+        performance.total_mem = 0
+
+    def wrapper(*args, **kwargs):
+        start_time = time.perf_counter()
+        tracemalloc.start()
+
+        result = func(*args, **kwargs)
+
+        current, peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        end_time = time.perf_counter()
+
+        performance.counter += 1
+        performance.total_time += (end_time - start_time)
+        performance.total_mem += peak
+
+        return result
+
+    return wrapper