Update readme.md

Added Material Design Icons within the icons section.

readme.md

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 | [IconBros](https://www.iconbros.com) | 7843+ free icons grouped in 182 collections |
 | [LogoHub](https://logohub.io/) | Generate and download your logo for free in PNG and SVG format |
 | [Devicon](https://konpa.github.io/devicon/) | Devicon is a set of icons representing programming languages, designing & development tools |
+| [Material Design Icons](https://materialdesignicons.com/) | A icon collection allowing designers and developers targeting various platforms to download icons in the format, color and size they need for any project. | 
 
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