message: docs(readme): add provider example links
diff: @@ -369,6 +369,7 @@ const FlowWithOwnProvider = () => (
  );
  ```
  +It is used in the [provider example](example/src/Provider/index.js).
  # Styling
  @@ -504,6 +505,7 @@ You can find all examples in the [example](example) folder or check out the live
  - [edges](https://react-flow.netlify.app/edges)
  - [empty](https://react-flow.netlify.app/empty)
  - [inactive](https://react-flow.netlify.app/inactive)
  +- [provider](https://react-flow.netlify.app/provider)
  # Development
  