Add student information and weighted sampling functions

Week01/info_ertugrul_kose.py

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+student_id = "210316038"
+full_name = "Ertuğrul Köse"

Week02/weighted_ertugrul_kose.py

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+import random
+
+def weighted_srs(dataset, k, w, with_replacement=False):
+    if with_replacement or w:
+        return random.choices(dataset, weights=w, k=k)
+    else:
+        return random.sample(dataset, k)

Week03/shifted_ertugrul_kose.py

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+def shifted(values):
+    n = len(values)
+    sorted_vals = sorted(values)
+    avg = sum(values) / n
+
+    if n % 2 == 0:
+        med = (sorted_vals[n // 2] + sorted_vals[n // 2 - 1]) / 2
+    else:
+        med = sorted_vals[n // 2]
+
+    return abs(avg - med) / abs(avg) * 100