docs: virtual machines running on kubevirt

Virtual-Machine.md

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+## How to create & managage KubeVirt's Virtual Machine from this flake?
+
+Use `aquamarine` as an example, we can create a virtual machine with the following command:
+
+```shell
+just upload-vm aquamarine
+```
+
+Then create the virtual machine by creating a yaml file at
+[ryan4yin/k8s-gitops](https://github.com/ryan4yin/k8s-gitops/tree/main/vms)
+
+Once the virtual machine `aquamarine` is created, we can deploy updates to it with the following
+commands:
+
+```shell
+just col aquamarine
+```
+
+If you're not familiar with remote deployment, please read this tutorial first:
+[Remote Deployment - NixOS & Flakes Book](https://nixos-and-flakes.thiscute.world/best-practices/remote-deployment)