Add CREDITS.md and LICENSE.md

CREDITS.md

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+# Attribution
+All Icons are based or original or modified versions from
+https://github.com/templarian/MaterialDesign
+
+This list gives attribution to the original icon creators.
+
+ * fire [@google](https://github.com/google)
+ * hand-extended [@goyney](https://github.com/goyney)
+ * power-sleep [@MrGrigri](https://github.com/MrGrigri)
+ * snowflake [@google](https://github.com/google)
+ * thermometer [@Templarian](https://github.com/Templarian)
+ * water [@google](https://github.com/google)
+ * water-opacity [@goyney](https://github.com/goyney)
+ * weather-sunny [@Templarian](https://github.com/Templarian)

LICENSE.md

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+# Pictogrammers Free License
+
+This icon collection is released as free, open source, and GPL friendly by
+the [Pictogrammers](http://pictogrammers.com/) icon group. 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.
+
+## Code: MIT (https://opensource.org/licenses/MIT)
+The MIT license applies to all non-font and non-icon files.