Add list views for channels, playlists and placeholders

Shared/Views/PlaceholderListItem.swift

@@ -0,0 +1,15 @@
+import Defaults
+import SwiftUI
+
+struct PlaceholderListItem: View {
+    var body: some View {
+        VideoBanner(id: UUID().uuidString, video: .fixture)
+            .redacted(reason: .placeholder)
+    }
+}
+
+struct PlaceholderListItem_Previews: PreviewProvider {
+    static var previews: some View {
+        PlaceholderListItem()
+    }
+}