Adding materials to the walking model

[acs]

Once we finish our model in #70 we are going to add materials to the model.

https://docs.blender.org/manual/en/latest/render/materials/introduction.html

«Materials control the appearance of meshes, curves, volumes and other objects. They define the substance that the object is made of, its color and texture, and how light interacts with it.»

• Substance
• Color
• Texture

In Godot we can also modify the materials.

https://docs.godotengine.org/en/stable/classes/class_material.html

[acs]

We have worked already on Godot with materials: #47. But let's review it in Blender also.