Added Xresources, still work in progress

Added my Xresources file, it is still a work in progress.
Moved to prezto, so removed my zshrc

Moved to the prezto set-up, so removed my zshrc file. You can find my fork of
Prezto on in my GitHub account as well. Made some changes, so forked to keep
them in GitHub as well (as recommended by the Prezto author).