Moved icons and added Pictogrammers licence

res/mdi/LICENCE

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+Pictogrammers Free License
+--------------------------
+
+Last Updated: February 1st, 2023
+
+This package is released as free, open-source, and GPL friendly by
+the [Pictogrammers](https://pictogrammers.com/). You may use it
+for commercial projects, open-source projects, or anything really.
+
+# Icons: Apache 2.0 (https://www.apache.org/licenses/LICENSE-2.0)
+Some of the icons are redistributed under the Apache 2.0 license. All other
+icons are either redistributed under their respective licenses or are
+distributed under the Apache 2.0 license.
+
+# Fonts: Apache 2.0 (https://www.apache.org/licenses/LICENSE-2.0)
+All web and desktop fonts are distributed under the Apache 2.0 license. Web
+and desktop fonts contain some icons that are redistributed under the Apache
+2.0 license. All other icons are either redistributed under their respective
+licenses or are distributed under the Apache 2.0 license.
+
+# Code: MIT (https://opensource.org/licenses/MIT)
+The MIT license applies to all non-font and non-icon files.

res/mdi/README.md

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+# Material Design Icons
+All icons here are sourced from [Pictogrammers](https://pictogrammers.com/), the original licence can be found in [the LICENCE file](./LICENCE)