Import CAD projects and cad-router v1

SimpleCADAPI/docs/api/Material.md

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+# Material
+
+## Class Definition
+
+```python
+class Material(material_id: str, name: Optional[str] = None, density: Optional[float] = None, density_unit: Optional[str] = None, color: Optional[Vec3] = None)
+```
+
+*Source: product.py*
+
+## Import Surface
+
+- top-level: `from simplecadapi import Material`
+
+## Description
+
+Material definition assigned to a Part through `assign_material_rpart`.