docs: zsh

.dotfiles/docs/zsh.md

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+# ZSH
+
+## Use emacs style keybindings
+
+``` zsh
+bindkey -e
+```
+
+## Use selective up/down command history
+
+In order to traverse the command history with up/down arrows but filtering by the command that is already written in the terminal, we need to use oh-my-zsh
+
+Get installation instructions from [the oh-my-zsh github repository](https://github.com/ohmyzsh/ohmyzsh).
+
+```
+source $HOME/.oh-my-zsh/oh-my-zsh.sh
+```