fixup! fixup! Add a mujoco simulation

Author: glpuga

ar4_mujoco_sim/mjcf/scene.xml

@@ -1,7 +1,7 @@
 <mujoco model="AR4 simple scene">
     <include file="mj_ar4.xml" />
 
-    <statistic center="0.3 0 0.4" extent="1" />
+    <statistic center="0.2 0 0.4" extent=".8" />
 
     <visual>
         <headlight diffuse="0.6 0.6 0.6" ambient="0.3 0.3 0.3" specular="0 0 0" />
@@ -14,7 +14,7 @@
             height="3072" />
         <texture type="2d" name="groundplane" builtin="checker" mark="edge" rgb1="0.2 0.3 0.4"
             rgb2="0.1 0.2 0.3"
-            markrgb="0.4 0.4 0.4" width="300" height="300" />
+            markrgb="0.8 0.8 0.8" width="300" height="300" />
         <material name="groundplane" texture="groundplane" texuniform="true" texrepeat="5 5"
             reflectance="0.2" />
     </asset>