Update README.md

Author: ajeetraina

README.md

@@ -31,3 +31,10 @@ GIT_USER=<Your GitHub username> USE_SSH=true yarn deploy
 ```
 
 If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.
+
+
+## Testing the local site
+
+```console
+npm run serve
+```