adding documentation

res/3d_models/raspberry_pi_pico_by_abdoubouam/source/README.md

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+3D Model from Sketchfab
+
+https://sketchfab.com/3d-models/raspberry-pi-pico-79aba8c863a14b4682e34e241f2159d2
+
+Under CC-BY 4.0 made by abdou bouam ( https://www.artstation.com/abdoubouam )

res/3d_models/raspberry_pi_pico_by_abdoubouam/source/pico.mtl

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+# Blender MTL File: 'pico.blend'
+# Material Count: 1
+
+newmtl Pi_Lowpoly
+Ns 225.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Bump textures\\pi_normal.png
+map_Kd textures\\Pi_diffuse.png
+map_Ks textures\\Pi_specular.png
+map_Ns textures\\pi_roughness.png
+refl textures\\Pi_metallic.png