[DOCS] Clarify installation.

Author: foxlet

README.md

@@ -4,10 +4,19 @@ Documentation to set up a simple macOS VM in QEMU, accelerated by KVM.
 By [@FoxletFox](https://twitter.com/foxletfox), and the help of many others.
 
 ## Getting Started
-You'll need a Linux system with `qemu`, `python` and the KVM extensions installed for this project. A Mac is **not** required.
+You'll need a Linux system with `qemu`, `python3`, `pip` and the KVM extensions installed for this project. A Mac is **not** required. Some examples for different distributions:
+
+```
+ sudo apt-get install qemu python3 python3-pip # for Ubuntu, Debian, Mint, and PopOS.
+ sudo pacman -S qemu python python-pip # for Arch.
+ sudo xbps-install -Su qemu python3 python3-pip # for Void Linux.
+```
 
 ## Step 1
-Run `jumpstart.sh` to download installation media for macOS (internet required). The default installation uses High Sierra, but you can upgrade to Mojave later.
+Run `jumpstart.sh` to download installation media for macOS (internet required). The default installation uses Catalina, but you can choose which version to get by adding either `--high-sierra`, `--mojave`, or `--catalina`. For example:
+```
+./jumpstart.sh --mojave
+```
 > Note: You can skip this if you already have `BaseSystem.img` downloaded. If you have `BaseSystem.dmg`, you will need to convert it with the `dmg2img` tool.
 
 ## Step 2