Add dependency installation instructions to README.md
requested to merge MichalKrasowski/epiphany:mkrasowski/add-deb-based-distro-missing-package-info into master
Thanks to Peter Hutterer for providing instructions on this.
http://who-t.blogspot.com/2018/07/meson-fails-with-native-dependency-not-found.html
Edited by Michał Krasowski