Add multilingual language and systems learning tracks

ceb/python-practice-20261101/lesson-3/main.py

@@ -0,0 +1,8 @@
+def remaining(total, done):
+    return max(0, total - done)
+
+assert remaining(4,1) == 3
+assert remaining(4,4) == 0
+assert remaining(4,5) == 0
+assert remaining(0,0) == 0
+print("Nipasar")