Add notes for 2026.02.11

notes-and-examples/2026.02.11/main.py

@@ -0,0 +1,24 @@
+class Node:
+    prev_node = None
+
+    def __init__(self, value) -> None:
+        self.value = value
+
+class Stack:
+    top: None | Node = None
+
+    def add(self, value):
+        # Implement as an exercise
+        pass
+    
+    def remove(self) -> None | Node:
+        # Implement as an exercise
+        pass
+    
+    def peek(self) -> None | Node:
+        # Implement as an exercise
+        pass
+    
+# Homework:
+# - Implement the other methods on the stack
+# - Implement linked list methods (see homework from 2026.01.28)