Added roo_material_icons. (#3694)

Author: dejwk

repositories.txt

@@ -4,6 +4,7 @@ https://github.com/DefHam140/IOTClient
 https://github.com/hoeken/PsychicHttp
 https://github.com/dejwk/roo_collections
 https://github.com/dejwk/roo_display
+https://github.com/dejwk/roo_material_icons
 https://github.com/dejwk/roo_scheduler
 https://github.com/dejwk/roo_time
 https://github.com/sensebox/senseBoxBLE