adds 2025 materials

exercises/Exercise 1b Unprotected code.md

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+## Exercise 1b: Unprotected code
+
+#### Goal
+
+Investigate what happens when importing from modules with "unprotected" code.
+
+#### Preparation
+
+(none)
+
+#### Tasks
+
+0. Create a file in the `src/` folder called `unprotectd_code.py`.
+
+1. Add a line in `unprotectd_code.py` that imports the `todays_special` function from `daily_menu.py`.
+
+2. **BEFORE YOU EXECUTE THE FILE**. Discuss with your partner what you think will happen when you run `unprotectd_code.py`.
+
+3. Run `unprotectd_code.py`. Does your prediction match reality?
+
+4. (optional, for those who know) Discuss with your partner:
+    * Why did this behaviour occur?
+    * Why is it not good?
+    * What can you do to "fix" the behaviour?