Add information about the location of CC BY-SA 3.0 related icon files.

Summary: COPYING.images does not have any information about the location of files.

Test Plan: N/A

Reviewers: cedric, jpeg, raster, Hermet, stefan_schmidt, Jaehyun_Cho, devilhorns

Reviewed By: devilhorns

Subscribers: #committers, zmike

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6479

COPYING.images

@@ -1,6 +1,7 @@
-Gesture Layer 2:
+Gesture Layer 2 (all the icons in data/elementary/images/g_layer):
   Illustrations provided by GestureWorks® (www.gestureworks.com)
   Creative Commons Attribution Sharealike license v 3.0.
+  http://gestureworks.com/
   http://gestureworks.com/icons-fonts
   http://creativecommons.org/licenses/by-sa/3.0/us/