moved etc into usr folder

files/system/usr/etc/skel/.oh-my-zsh/plugins/percol/README.md

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+# percol
+
+Provides some useful function to make [percol](https://github.com/mooz/percol) work with zsh history and
+the [jump plugin](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/jump), optionally.
+
+To use it, add `percol` to the plugins array in your zshrc:
+
+```zsh
+plugins=(... percol)
+```
+
+## Requirements
+
+- `percol`: install with `pip install percol`.
+
+- (_Optional_) [`jump`](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/jump) plugin: needs to be
+  enabled before the `percol` plugin.
+
+## Usage
+
+- <kbd>CTRL-R</kbd> (bound to `percol_select_history`): you can use it to grep your history with percol.
+
+- <kbd>CTRL-B</kbd> (bound to `percol_select_marks`): you can use it to grep your jump bookmarks with percol.