Created Inject CSS Code (markdown)

Inject-CSS-Code.md

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+Since version 0.5.8, you can inject CSS code to services. You can use it to optimize default styles, make services full size or for example, turn it to the dark side! 😉 
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+To do it, just go to the Add Window by adding a new service or editing an existing one, and in the **Advanced** section, you will see a textarea to add your CSS.
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+We recommend to get some styles from [UserStyles](https://userstyles.org/). To use them, search the style you want to use for the service and click **Show CSS** to see the CSS. Then copy all the CSS showed but skipping first and latest lines ([see video](https://www.useloom.com/share/567baa7d516e41b89480a058860c0cf0)).