updated README

Author: kgizdov

README.md

@@ -3,4 +3,8 @@ ROOT 6 with custom options to accommodate Arch Linux and GCC 6.2
 
 Base AUR package available [here](https://aur.archlinux.org/packages/root/)
 
-AUR package with XROOTD available [here](https://aur.archlinux.org/packages/root-extra/)
+AUR package with Pythia8 and XRootD available [here](https://aur.archlinux.org/packages/root-extra/)
+
+[XRootD](https://aur.archlinux.org/packages/xrootd-abi0/)
+
+[Pythia8](https://aur.archlinux.org/packages/pythia8/)