add link to Material Symbols in README

README.md

@@ -75,6 +75,8 @@ paper-tab.iron-selected > ha-icon[title='Lights'] {
 }
 ```
 
+Also check out [Material Symbols](https://github.com/beecho01/material-symbols) to use updated material icons, as shown in the screenshots!
+
 This theme was initially modified from the [Graphite theme](https://github.com/TilmanGriesel/graphite), as I found that it was my favorite of the available Home Assistant themes on HACS when I started creating this theme. Therefore, it contains similar logic for reusing variables and possibly some unusued variables.
 
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