Update README.md

README.md

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 # What is this?
 
+The github.dev web-based editor is a lightweight editing experience that runs entirely in your browser. You can navigate files and source code repositories from GitHub, and make and commit code changes.
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 Press the `.` key on any repository or pull request, or swap `.com` with `.dev` in the URL, to go directly to a VS Code environment in your browser.
 
+To get started coding and adding files, try out the `.` key on any of your repos or PRs. You can also check out [http://github.dev/microsoft/vscode](http://github.dev/microsoft/vscode) as an example of github.dev in action. 
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+Preview the gif below to get a quick demo of github.dev in action.
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 ![github dev](https://user-images.githubusercontent.com/856858/130119109-4769f2d7-9027-4bc4-a38c-10f297499e8f.gif)
 
 # Why?