add double_node model

.gitattributes

@@ -0,0 +1,2 @@
+.*             export-ignore
+models/*.blend export-ignore

README.md

@@ -5,6 +5,15 @@
 
 A set (currently only one) of very simple models for [Minetest](https://www.minetest.net/).
 
+![screenshot](screenshot.png)
+
+#### Models
+
+- double_node
+	- for nodes with dimensions x=1, y=2
+
+![double_node_preview](previews/model.png) ![double_node_texture_map](previews/texture_map.png)
+
 ### Licensing
 
 - [Creative Commons Zero (CC0) 1.0](https://creativecommons.org/publicdomain/zero/1.0/)

models/double_node.obj

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+# Blender v2.93.2 OBJ File: 'server_shop_2.blend'
+# www.blender.org
+mtllib server_shop.mtl
+o Cube
+v 0.500000 -0.500000 -0.500000
+v 0.500000 1.500000 -0.500000
+v -0.500000 -0.500000 -0.500000
+v -0.500000 1.500000 -0.500000
+v 0.500000 -0.500000 0.500000
+v 0.500000 1.500000 0.500000
+v -0.500000 -0.500000 0.500000
+v -0.500000 1.500000 0.500000
+vt 0.500000 0.250043
+vt 0.500000 0.000087
+vt 0.749957 0.000087
+vt 0.749957 0.250043
+vt 0.749957 0.749978
+vt 0.749957 0.250065
+vt 0.999914 0.250065
+vt 0.999914 0.749978
+vt 0.000087 0.749978
+vt 0.000087 0.250065
+vt 0.250043 0.250065
+vt 0.250043 0.749978
+vt 0.500000 0.999957
+vt 0.500000 0.750000
+vt 0.749957 0.999957
+vt 0.500000 0.250065
+vn -0.0000 -1.0000 -0.0000
+vn -1.0000 0.0000 0.0000
+vn 0.0000 -0.0000 1.0000
+vn 0.0000 1.0000 0.0000
+vn -0.0000 0.0000 -1.0000
+vn 1.0000 -0.0000 -0.0000
+usemtl Material
+s off
+f 1/1/1 5/2/1 7/3/1 3/4/1
+f 4/5/2 3/6/2 7/7/2 8/8/2
+f 8/9/3 7/10/3 5/11/3 6/12/3
+f 6/13/4 2/14/4 4/5/4 8/15/4
+f 2/14/5 1/16/5 3/6/5 4/5/5
+f 6/12/6 5/11/6 1/16/6 2/14/6