Update README.md with Asciinema cast

Author: struanb

README.md

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 ## Introduction
 
-RunCVM (Run Container Virtual Machine) is an experimental open-source Docker container runtime for Linux, created by Struan Bartlett at NewsNow Labs, that makes launching standard containerised workloads in VMs as easy as launching them in containers e.g.:
+RunCVM (Run Container Virtual Machine) is an experimental open-source Docker container runtime for Linux, created by Struan Bartlett at NewsNow Labs, that makes launching standard containerised workloads and system workloads (e.g. Systemd, Docker, even OpenWrt) in VMs as easy as launching a container.
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+<p align="center">
+<a title="Click to view on Asciinema" href="https://asciinema.org/a/TJyiRZxjm7o673Ix6nZf3zh35" target="_blank"><img src="https://github.com/newsnowlabs/runcvm/assets/354555/7b1a7c87-5444-4a7e-bac6-75607382571e" alt="Install RunCVM and then launch an Alpine Container VM" width="900"></a>
+</p>
 
 ## Quick start