Add build/config.sh, doh

Add prereqs to README.md

Add mkarchiso check

README.md + documentation tweaks

README.md: build.sh should be main.sh

Update README.md

Update README.md

Various fixes; add install_repo

Comment out config options relevant only for esotericnonsense

Fix URLs to be public

Add license to README.md

Add GPLv2-only LICENSE

Initial commit