Add contributor credit.

Docs/Urho3D.dox

@@ -83,6 +83,7 @@ Urho3D development, contributions and bugfixes by:
 - Pete Leigh
 - Frode 'Modanung' Lindeijer
 - Thorbjørn Lindeijer
+- Nathanial Lydick
 - Xavier Maupeu
 - Jonne Nauha
 - Paul Noome

README.md

@@ -37,6 +37,7 @@ Urho3D development, contributions and bugfixes by:
 - Pete Leigh
 - Frode 'Modanung' Lindeijer
 - Thorbjørn Lindeijer
+- Nathanial Lydick
 - Xavier Maupeu
 - Jonne Nauha
 - Paul Noome