message: Update Readme with a talks on Open Infra Summit
  The talk covers a few aspects about "Dragonfly Image Service", aiming to help everyone get more details.
diff: @@ -46,3 +46,4 @@ Run `nydusd` Daemon to serve Nydus image: [Nydusd](./docs/nydusd.md).
  Browse the documentation to learn more. Here are some topics you may be interested in:
  - [A Nydus Tutorial for Beginners](./docs/tutorial.md)
  +- Our talk on Open Infra Summit 2020: [Toward Next Generation Container Image](https://drive.google.com/file/d/1LRfLUkNxShxxWU7SKjc_50U0N9ZnGIdV/view)
  