Update documentation.

README.md

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-# quickemu
-Simple shell script to manage Qemu virtual machines.
+<h1 align="center">
+  <img src=".github/logo.png" alt="Quickemu" />
+  <br />
+  Quickemu
+</h1>
+
+<p align="center"><b>Simple shell script to manage Qemu virtual machines.</b></p>
+<div align="center"><img src=".github/screenshot.png" alt="Quickemu Screenshot" /></div>
+<p align="center">Made with 💝 for <img src="https://raw.githubusercontent.com/anythingcodes/slack-emoji-for-techies/gh-pages/emoji/tux.png" align="top" width="24" /></p>
+
+## Introduction
+
+Quickemu is a very simple script to "manage" Qemu virtual machines. Each virtual
+machine configuration is broadly the same requiring minimal setup. The main
+objective of the project is to enable quick testing of desktop Linux
+distributions where the virtual machines can be stored anywhere, such as external
+USB storage.
+
+See the video where I explain my motivations for creating this script.
+
+[![Replace VirtualBox with Bash & QEMU](https://img.youtube.com/vi/AOTYWEgw0hI/0.jpg)](https://www.youtube.com/watch?v=AOTYWEgw0hI)
+
+## Installation
+
+### Ubuntu 19.10 or newer
+
+Install qemu
+
+```bash
+sudo apt install qemu qemu-kvm libvirt-clients libvirt-daemon bridge-utils ovmf
+sudo adduser ${SUDO_USER} kvm
+```
+
+Install `samba` *(optional)* if you want to share home directories with guest virtual machines
+
+```bash
+sudo apt install samba
+```
+
+Install the `qemu-virgil` snap *(optional)*
+
+```bash
+snap install qemu-virgil
+snap connect qemu-virgil:removable-media
+```
+
+## Usage
+
+  * Download a .iso image of a Linux distribution
+  * Create a VM configuration file; for example `ubuntu.conf`
+
+```
+iso="/media/$USER/Quickemu/ubuntu/focal-desktop-amd64.iso"
+disk_img="/media/$USER/Quickemu/ubuntu/focal-desktop-amd64.qcow2
+```
+
+  * Use `quickemu.sh` to start the virtual machine:
+
+```
+./quickemu --vm ubuntu-focal-desktop.conf
+```
+
+Here are the full usage instructions:
+
+```
+Usage
+  quickemu --vm ubuntu.conf
+
+You can also pass optional parameters
+  --delete   : Delete the disk image.
+  --efi      : Enable EFI BIOS (default).
+  --legacy   : Enable legacy BIOS.
+  --restore  : Restore the snapshot.
+  --samba    : Share your home directory to the guest.
+  --snapshot : Create a disk snapshot.
+  --virgil   : Use virgil, if available.
+```
+
+## TODO
+
+  - [ ] Make display configuration more robust
+  - [ ] Improve stdout presentation
+  - [ ] Make disk image optionally size configurable