- Introduce jk to exit edit mode

- Introduce commands goto and find

Status bar

Command mode
 - / Search
 - :marks
 - Visual line mode
 - iw and iW motions for d, c, y, and visual mode (e.g. diw or viW)
 - Automatically switch to visual mode when making a selection with cursor
 - Special 0 ~ 9 marks (like `0, `1, `2 ...) for recently visited scripts

New commands
 - J (join lines)
 - D and C
 - cc
 - O (insert line above)
 - I and A (insert at start/end of line)
 - ^ (jump to first non-whitespace character in line)
 - yy (line yank)
 - x (delete single character)
 - s
 - r (replace character)
 - n and N (jump to search next/previous search result)
 - zz (center screen at caret)
 - >> and << (indent/unindent)
 - m and ` (create/jump to mark

Create LICENSE