Create example.

[nitaking]

Motivation

I created example.
It's rare an example in eslint plugin, but easier to imagine this plugin with an example including the directory structure, also confirm the actual behavior.

（eslint pluginでexampleは珍しいですが、このプラグインはディレクトリ構造を含めてexampleが存在するほうがイメージしやすく、実際の挙動の確認も含めてコミットしました。）

[YutamaKotaro]

Hi bro 😀

Great thank you !!
However, as I was thinking about creating new repository for examples, so would it be possible for you to send pull request to the repository ??

Here's.
https://github.com/YutamaKotaro/eslint-plugin-dependencies-relation-examples

Feel free to send it 😝