Add Customization.

Customization.md

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+# Customization
+
+In `~/.bashrc/` edit the variables.
++ To change the order of plugins, edit the `WISH_PLUGINS` array.
+	+ e.g. To make your prompt with path, date, vcs plugins, add `WISH_PLUGINS=(path date vcs)`.
++ To change the theme, edit the `WISH_THEME` variable (Default: plain).
+	+ e.g. To set theme to `plain`, add `WISH_THEME=plain`
++ To enable/disable powerline fonts, set `WISH_POWERLINE` to `1` or `0`.
+
+## Example config
+
+```bash
+WISH_DATE_FORMAT="%d %b %H:%M" # Look in date plugin for details
+WISH_PLUGINS=(newline exit_code bg_jobs tmux date battery path python_venv newline vcs space)
+WISH_POWERLINE=1
+WISH_THEME=rgb_gradient
+```
+
+![Example Config](/media/example_config.png)
+
+## Plugins
+
+[Check out the list of plugins here](/Plugins)