Updating README with guidance to use rootless Docker for linux users (#2817)

* Updating README with guidance to use rootless Docker for linux users as a more secure configuration

Co-authored-by: Uche Nkadi <uchen@microsoft.com>

README.md

@@ -12,7 +12,7 @@ The Docker extension makes it easy to build, manage, and deploy containerized ap
 
 [Install Docker](https://docs.docker.com/install/) on your machine and add it to the system path.
 
-On Linux, you should also [enable Docker CLI for the non-root user account](https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user) that will be used to run VS Code.
+On Linux, you should [enable rootless Docker](https://docs.docker.com/engine/security/rootless/) (more secure) or [enable Docker CLI for the non-root user account](https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user) (less secure) that will be used to run VS Code.
 
 To install the extension, open the Extensions view, search for `docker` to filter results and select Docker extension authored by Microsoft.