Splitting up docs

doc/zsh/themes.md

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+### Adding your own ZSH theme
+
+If you want to add your own zsh theme, you can place it in `~/.zsh.prompts` and it will automatically be picked up by the prompt loader.
+
+Make sure you follow the naming convention of `prompt_[name]_setup`
+
+```
+touch ~/.zsh.prompts/prompt_mytheme_setup
+```
+
+See also the [Prezto](https://github.com/sorin-ionescu/prezto) project for more info on themes.
+
+### Customizing ZSH & Picking a theme
+
+If you want to customize your zsh experience, yadr provides two hooks via `~/.zsh.after/` and `~/.zsh.before/` directories.
+In these directories, you can place files to customize things that load before and after other zsh customizations that come from `~/.yadr/zsh/*`
+
+For example, to override the theme, you can do something like this:
+
+```
+echo "prompt yourprompt" > ~/.zsh.after/prompt.zsh
+```
+
+Next time you load your shell, this file will be read and your prompt will be the youprompt prompt. Use `prompt -l` to see the available prompts.