add LICENSE to each illustration.

Author: tenntenn

README.md

@@ -3,24 +3,46 @@
 Vector data of gopher.
 
 The Go gopher was designed by Renee French. (http://reneefrench.blogspot.com/)
-The gopher vector data was made by Takuya Ueda (http://u.hinoichi.net).
-Licensed under the Creative Commons 3.0 Attributions license.
-
 
 ## gopher
+gopher.{ai,svg,png} was created by Takuya Ueda (http://u.hinoichi.net).
+Licensed under the Creative Commons 3.0 Attributions license.
+
 <img width="30%" src="https://raw.github.com/golang-samples/gopher-vector/master/gopher.png"/>
+<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.ja">
+	<img alt="Creative Commons licensing" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
+</a>
 
 ## gopher-front
+gopher-front.{ai,svg,png} was created by Takuya Ueda (http://u.hinoichi.net).
+Licensed under the Creative Commons 3.0 Attributions license.
+
 <img width="30%" src="https://raw.github.com/golang-samples/gopher-vector/master/gopher-front.png"/>
+<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.ja">
+	<img alt="Creative Commons licensing" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
+</a>
+
 
 ## gopher-side_color
+gopher-side_color.{ai,svg,png} was created by Takuya Ueda (http://u.hinoichi.net).
+Licensed under the Creative Commons 3.0 Attributions license.
+
 <img width="30%" src="https://raw.github.com/golang-samples/gopher-vector/master/gopher-side_color.png"/>
+<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.ja">
+	<img alt="Creative Commons licensing" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
+</a>
 
 
 ## gopher-side_path
-<img width="30%" src="https://raw.github.com/golang-samples/gopher-vector/master/gopher-side_path.png"/>
+gopher-side_path.{ai,svg,png} was created by Takuya Ueda (http://u.hinoichi.net).
+Licensed under the Creative Commons 3.0 Attributions license.
 
+<img width="30%" src="https://raw.github.com/golang-samples/gopher-vector/master/gopher-side_path.png"/>
 <a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.ja">
 	<img alt="Creative Commons licensing" style="border-width:0" src="http://i.creativecommons.org/l/by/3.0/88x31.png" />
 </a>
 
+## Go Gopher vector illustration (gopher-stand)
+Go Gopher vector illustration (gopher-stand.{ai,jpg,pdf}) by Hugo Arganda @argandas (http://about.me/argandas).
+
+<img src="https://github.com/golang-samples/gopher-vector/blob/master/gopher-stand.jpg"/>