Add Compose to a View based app

How `R.plurals.number_of_stars` is defined is not covered in the tutorial.

One needs to add
```xml
    <plurals name="number_of_stars">
        <item quantity="one">%d star</item>
        <item quantity="other">%d stars</item>
    </plurals>
```
to `res/values/strings.xml`