add licesen file
add licesen file

stefanocudini/leaflet-panel-layers,andrewmartini/leaflet-panel-layers,droyad/leaflet-panel-layers,mikifus/leaflet-panel-layers,mikifus/leaflet-panel-layers,andrewmartini/leaflet-panel-layers,stefanocudini/leaflet-panel-layers,droyad/leaflet-panel-layers