Added Zwerkules Rural override tileset

Added Zwerkules Rural override tileset.

_content/biorural/ttr01_y11_01.wok

@@ -0,0 +1,67 @@
+# Rewritten by CleanModels 3 Version 3.5.1 Mon Jul 08 17:34:55 2019
+#MAXWALKMESH  ASCII
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+  wirecolor 1 1 1
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+  shadow 0
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+endnode
+endwalkmeshgeom ttr01_y11_01