add blank material files

bshift/pbr/models/boid.mdl/boid.mdl.mat

@@ -0,0 +1,8 @@
+
+{
+"for" "#models/boid/B_Top1.mdl"
+//"basecolor_map" "B_Top1.png"
+//"normal_map" "B_Top1_normal.png"
+//"metal_map" "B_Top1_metal.png"
+//"roughness_map" "B_Top1_roughness.png"
+}