Extract progress view, show video details loading

Shared/Views/PlaceholderProgressView.swift

@@ -0,0 +1,21 @@
+import SwiftUI
+
+struct PlaceholderProgressView: View {
+    var body: some View {
+        VStack {
+            Spacer()
+            HStack {
+                Spacer()
+                ProgressView()
+                Spacer()
+            }
+            Spacer()
+        }
+    }
+}
+
+struct PlaceholderProgressView_Previews: PreviewProvider {
+    static var previews: some View {
+        PlaceholderProgressView()
+    }
+}