New introduction section in IOS docs

src/ifcopenshell-python/docs/introduction/introduction_to_bim.rst

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+Introduction to BIM
+===================
+
+**Building Information Modeling**, or **BIM**, is a way of digitally describing
+our built environment to computers. Aspects of our built environment that can be
+described are:
+
+- **Products**, like walls, doors, and windows
+- **Processes**, like construction or maintenance tasks, and procedures
+- **Resources**, like labour, materials, and equipment
+- **Controls**, like permits, orders, costs, or calendar availability
+- **Actors**, like occupants, clients, architects, and liable parties
+- **Groups**, like systems, inventories, or zones
+
+These objects may have lots of data and relationships. Examples of data might be
+classification systems, physical materials, associated documents, simulation
+results, and construction types. The data may be relevant to multiple
+disciplines, such as architecture, engineering, and construction.
+
+.. note::
+
+   BIM data is very different from a regular 3D model. In fact, geometry is
+   optional, and most data is non-geometric. This means that it is not simply a
+   3D format that you can import or export from and expect meaningful results.
+
+**Industry Foundation Classes**, or **IFC**, is an international standard for
+**BIM**. **IFC** is the most well-established open digital language for our
+built environment. Most software will be able to describe their **BIM** data
+using **IFC**. Most commonly, **IFC** models will be shared as a ``.ifc`` file.
+
+For example, **IFC** will define a wall as an object that can have a name,
+construction type, and quantities. **IFC** will also describe that a wall that
+be associated with a location, like a building storey, or have an associated
+cost item in a schedule.
+
+When you use **IfcOpenShell**, you will be able to view and create **BIM**
+objects and relationships using the **IFC** standard.