add ssh_agent.zsh
change things a bit
hide the startup files
add .gitignore
use vi keybindings
change to $ZDOTDIR
update README
Merge branch 'simple'

* simple:
  update README
  change to $ZDOTDIR
  use vi keybindings
  add .gitignore
  hide the startup files
  change things a bit
  add ssh_agent.zsh