Add methods-exercise1.md: advantages of using methods vs free functions

Author: Iswanna

prep/methods-exercise1.md

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+Here are the advantages of using methods instead of free functions:
+
+1. **Organization** - Methods are part of a class, so related code is organized together in one place.
+
+2. **Access to object data** - Methods can directly access the object's attributes (like `person.age`). Free functions need the object passed as a parameter.
+
+3. **Clearer intent** - When you see `person.is_adult()`, it's clear that you're asking "is this person an adult?" instead of `is_adult(person)`.
+
+4. **Less parameter passing** - Methods use `self` automatically, so you don't need to pass the object as a parameter every time.
+
+5. **Better grouping** - All actions for a `Person` are grouped together inside the `Person` class, not scattered around your code.
+
+6. **Easier to maintain** - If you need to change how `is_adult()` works, you only need to update the method in one place inside the class.
+
+7. **More readable** - `imran.is_adult()` is easier to read and understand than `is_adult(imran)`.
+
+**Example comparison:**
+
+```python
+# Free function (current approach)
+print(is_adult(imran))
+
+# Method (better approach)
+print(imran.is_adult())
+```
+
+The method version is clearer and more organized!