Add structure for 12 days

README.md

@@ -1,7 +1,75 @@
 # Adventure of Code 2025
 
-## Day 01
+## Day 01 – Secret Entrance
 
 [Page](https://adventofcode.com/2025/day/1)  
 [Challenge](day01/README.md)  
 [Notes](day01/Notes.md)
+
+---
+
+## Day 02 – tba
+
+[Page](https://adventofcode.com/2025/day/2)  
+[Challenge](day02/README.md)  
+[Notes](day02/Notes.md)
+
+## Day 03 – tba
+
+[Page](https://adventofcode.com/2025/day/3)  
+[Challenge](day03/README.md)  
+[Notes](day03/Notes.md)
+
+## Day 04 – tba
+
+[Page](https://adventofcode.com/2025/day/4)  
+[Challenge](day04/README.md)  
+[Notes](day04/Notes.md)
+
+## Day 05 – tba
+
+[Page](https://adventofcode.com/2025/day/5)  
+[Challenge](day05/README.md)  
+[Notes](day05/Notes.md)
+
+## Day 06 – tba
+
+[Page](https://adventofcode.com/2025/day/6)  
+[Challenge](day06/README.md)  
+[Notes](day06/Notes.md)
+
+## Day 07 – tba
+
+[Page](https://adventofcode.com/2025/day/7)  
+[Challenge](day07/README.md)  
+[Notes](day07/Notes.md)
+
+## Day 08 – tba
+
+[Page](https://adventofcode.com/2025/day/8)  
+[Challenge](day08/README.md)  
+[Notes](day08/Notes.md)
+
+## Day 09 – tba
+
+[Page](https://adventofcode.com/2025/day/9)  
+[Challenge](day09/README.md)  
+[Notes](day09/Notes.md)
+
+## Day 10 – tba
+
+[Page](https://adventofcode.com/2025/day/10)  
+[Challenge](day10/README.md)  
+[Notes](day10/Notes.md)
+
+## Day 11 – tba
+
+[Page](https://adventofcode.com/2025/day/11)  
+[Challenge](day11/README.md)  
+[Notes](day11/Notes.md)
+
+## Day 12 – tba
+
+[Page](https://adventofcode.com/2025/day/12)  
+[Challenge](day12/README.md)  
+[Notes](day12/Notes.md)