Complete the modifications of commit b863a68

Author: ShreckYe

compose-multiplatform-material/src/commonMain/kotlin/com/huanshankeji/compose/material/IconButton.kt

@@ -19,7 +19,7 @@ expect fun IconButton(
 fun IconButton(
     onClick: () -> Unit,
     modifierOrAttrs: ModifierOrAttrs<IconButtonElement> = null,
-    materialIcon: MaterialIcon
+    materialIcon: MaterialIcon,
+    contentDescription: String?
 ) =
-    IconButton(onClick, modifierOrAttrs) { Icon(materialIcon) }
-
+    IconButton(onClick, modifierOrAttrs) { Icon(materialIcon, contentDescription) }

demo/src/commonMain/kotlin/com/huanshankeji/compose/material/demo/Composables.kt

@@ -12,9 +12,9 @@ fun App() {
     TopAppBarScaffold({
         Text("Compose Multiplatform Material demo")
     }, {
-        MaterialIconNavButton({}, MaterialIcons.Menu)
+        MaterialIconNavButton({}, MaterialIcons.Menu, "menu")
     }, {
-        MaterialIconActionButton({}, MaterialIcons.Search)
+        MaterialIconActionButton({}, MaterialIcons.Search, "search")
     }) {
         Card {
             Box({
@@ -31,7 +31,7 @@ fun App() {
                     Label(count.toString())
                 }
 
-                IconButton(onClick, materialIcon = MaterialIcons.Search)
+                IconButton(onClick, materialIcon = MaterialIcons.Search, contentDescription = "increment count")
 
                 List {
                     item {