Add placeholders

Shared/Views/PlaceholderCell.swift

@@ -0,0 +1,16 @@
+import Defaults
+import SwiftUI
+
+struct PlaceholderCell: View {
+    var body: some View {
+        VideoCell(video: .fixture)
+            .redacted(reason: .placeholder)
+    }
+}
+
+struct PlaceholderCell_Previews: PreviewProvider {
+    static var previews: some View {
+        PlaceholderCell()
+            .injectFixtureEnvironmentObjects()
+    }
+}