creating a list of categories, each category has a list of items

MainActivity.kt

private val categories = mutableListOf(
    Category(
        "Category 1",
        Item("Item 1"),
        Item("Item 2"),
        Item("Item 3"),
        Item("Item 4"),
        Item("Item 5"),
        Item("Item 6")
    ),
    ...
    ...
    ...
    Category(
        "Category 5",
        Item("Item 1"),
        Item("Item 2"),
        Item("Item 4"),
        Item("Item 5"),
    ),
)