add blank material files

cstrike/pbr/models/w_knife.mdl/w_knife.mdl.mat

@@ -0,0 +1,24 @@
+
+{
+"for" "#models/w_knife/blade.mdl"
+//"basecolor_map" "blade.png"
+//"normal_map" "blade_normal.png"
+//"metal_map" "blade_metal.png"
+//"roughness_map" "blade_roughness.png"
+}
+
+{
+"for" "#models/w_knife/handle.mdl"
+//"basecolor_map" "handle.png"
+//"normal_map" "handle_normal.png"
+//"metal_map" "handle_metal.png"
+//"roughness_map" "handle_roughness.png"
+}
+
+{
+"for" "#models/w_knife/handle_top.mdl"
+//"basecolor_map" "handle_top.png"
+//"normal_map" "handle_top_normal.png"
+//"metal_map" "handle_top_metal.png"
+//"roughness_map" "handle_top_roughness.png"
+}