Installing Deno from scratch

[KnorpelSenf]

Many people who are not familiar with Deno yet see TypeScript projects and automatically assume that they're Node.js projects. I already added this extension to my recommended extensions for VSCode, but even if people install it, they are still missing the Deno CLI itself.

It would be cool if this extension could simply prompt if it shall run the shell command to install the Deno CLI on the system. That way, people will have a much easier time getting started with Deno projects.

This command should probably also be available inside the editor. That way, it will be possible to install specific Deno versions right from VSCode.