Add ui.el and disable startup screen.

Create and set init.el to load ui.el. Disable startup screen.
Disable scratch-mode message.
Change "yes-or-no"-prompt to "y-or-n"-prompt.
Disable "create-new-buffer-if-not-choosen-buffer-exist"-prompt.
Disable menu bar, tool bar and scroll bar.
Show cursor column position (line and character).
Set tab width to 4 spaces.
Enable electric pair mode.
Highlight current line.
Show which parenthesis matches the one I'm looking at.
Install and load Monokai theme.