Added contributor credit.

Docs/Urho3D.dox

@@ -89,6 +89,7 @@ Urho3D development, contributions and bugfixes by:
 - Nick Royer
 - Jonathan Sandusky
 - Miika Santala
+- Hualin Song
 - James Thomas
 - Joshua Tippetts
 - Daniel Wiberg

README.md

@@ -41,6 +41,7 @@ Urho3D development, contributions and bugfixes by:
 - Nick Royer
 - Jonathan Sandusky
 - Miika Santala
+- Hualin Song
 - James Thomas
 - Joshua Tippetts
 - Daniel Wiberg