Update dialprops.md (#278)

adding dial example

Author: Greg B

website/docs/api/interfaces/dialprops.md

@@ -4,6 +4,23 @@ title: "DialProps"
 sidebar_label: "DialProps"
 ---
 
+The Dial provides ability to add and manipulate native dial slider widgets. It is based on
+[NodeGui's QDial](https://docs.nodegui.org/docs/api/generated/classes/qdial/).
+## Example
+```javascript
+import React from "react";
+import { Renderer, Dial, Window } from "@nodegui/react-nodegui";
+const App = () => {
+  return (
+    <Window>
+      <Dial />
+    </Window>
+  );
+};
+Renderer.render(<App />);
+
+```
+
 ## Hierarchy
 
   ↳ [ViewProps](viewprops.md)‹QDialSignals›