example: Add ATTRIBUTION.txt

Artur Ostręga · Artur Ostręga · commit 2d0eff735684 · 2016-02-26T02:52:29.000-06:00
diff --git a/example/ATTRIBUTION.txt b/example/ATTRIBUTION.txt
@@ -0,0 +1,2 @@
+Guy sprite (http://opengameart.org/lpc-art-entries) by Skyler Robert Colladay / CC-BY-SA 3.0 & GPL 3.0
+Duck photo (http://www.pdpics.com/photo/377-white-duck-in-greenish-water/) by Abeer Khan / public domain (CCO)

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Guy sprite (http://opengameart.org/lpc-art-entries) by Skyler Robert Colladay / CC-BY-SA 3.0 & GPL 3.0`
	`2`	`+Duck photo (http://www.pdpics.com/photo/377-white-duck-in-greenish-water/) by Abeer Khan / public domain (CCO)`