Add and improve domain (WIP)

composeApp/src/commonMain/kotlin/domain/items.kt

@@ -0,0 +1,44 @@
+@file:OptIn(ExperimentalResourceApi::class)
+
+package domain
+
+import org.jetbrains.compose.resources.DrawableResource
+import org.jetbrains.compose.resources.ExperimentalResourceApi
+
+fun category(block: CategoryContext.() -> Unit): ItemCategory {
+    class CategoryImpl(val items: MutableList<ItemImpl>) :
+        ItemCategory, List<Item> by items {
+        inner class ItemImpl(
+            override val image: DrawableResource
+        ) : Item {
+            override val category: CategoryImpl = this@CategoryImpl
+
+            init {
+                items.add(this)
+            }
+        }
+    }
+
+    val ctx = object : CategoryContext {
+        val category = CategoryImpl(mutableListOf())
+
+        override fun item(image: DrawableResource) {
+            category.ItemImpl(image)
+        }
+    }
+    ctx.block()
+    return ctx.category
+}
+
+interface CategoryContext {
+    fun item(image: DrawableResource)
+}
+
+interface Item {
+    val category: ItemCategory
+
+    @OptIn(ExperimentalResourceApi::class)
+    val image: DrawableResource
+}
+
+interface ItemCategory : List<Item>