Merge pull request #204 from jacobweinstock/update-capt-doc

Update CAPT doc:

## Description

<!--- Please describe what this PR is going to change -->
I found there was some missing requirements to get everything working.

## Why is this needed

<!--- Link to issue you have raised -->

Fixes: #

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran to -->
<!--- see how your change affects other areas of the code, etc. -->


## How are existing users impacted? What migration steps/scripts do we need?

<!--- Fixes a bug, unblocks installation, removes a component of the stack etc -->
<!--- Requires a DB migration script, etc. -->


## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

capt/README.md

@@ -10,6 +10,10 @@ Start by reviewing and installing the [prerequisites](#prerequisites) and unders
 
 ## Prerequisites
 
+### Operating System
+
+This playground has only been tested on Ubuntu 22.04 LTS. If you are using a virtual machine, ensure that you have hardware virtualization enabled.
+
 ### Binaries
 
 - [Libvirtd](https://wiki.debian.org/KVM) >= libvirtd (libvirt) 8.0.0
@@ -22,6 +26,14 @@ Start by reviewing and installing the [prerequisites](#prerequisites) and unders
 - [yq](https://github.com/mikefarah/yq/#install) >= v4.44.2
 - [task](https://taskfile.dev/installation/) >= 3.37.2
 
+### Packages
+
+The `ovmf` package is required for the libvirt VMs to run properly. OVMF is a port of Intel's tianocore firmware to the qemu virtual machine. Install it with the following command.
+
+```bash
+sudo apt install ovmf
+```
+
 ### Hardware
 
 - at least 60GB of free and very fast disk space (etcd is very disk I/O sensitive)