Blender docs: More stubs, walls, doors, windows

src/blenderbim/docs/users/modeling/understanding_ifc.rst

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+=================
+Understanding IFC
+=================
+
+Industry Foundation Classes (IFC) is an open, international standard for Building Information Modeling (BIM) data.
+It provides a standardized way to describe, exchange, and share information about building and construction industry data.
+
+IFC Schema
+----------
+
+The IFC schema defines a comprehensive set of consistent data representations of building information for exchange between AEC software applications.
+It covers various aspects of buildings throughout their lifecycle, from conception to demolition.
+
+Basic Spatial Objects
+---------------------
+
+IFC organizes building information in a hierarchical structure:
+
+- IfcProject
+- IfcSite
+- IfcBuilding
+- IfcBuildingStorey
+- IfcSpace
+
+buildingSMART and Standards
+---------------------------
+
+buildingSMART International (bSI) is the organization responsible for developing and maintaining the IFC standard.
+They also develop other related standards like BCF (BIM Collaboration Format) and bSDD (buildingSMART Data Dictionary).
+
+IfcOpenShell
+------------
+
+IfcOpenShell is the open-source software library used by BlenderBIM to read, write, and manipulate IFC files.
+It provides the core functionality for working with IFC data.
+
+Interoperability and Other Standards
+------------------------------------
+
+IFC is part of a broader ecosystem of open standards in the AEC industry. Other relevant standards include:
+
+- COBie (Construction Operations Building Information Exchange)
+- CityGML (City Geography Markup Language)
+- gbXML (Green Building XML)
+
+The use of open standards like IFC ensures interoperability between different software tools
+and preserves data integrity throughout the building lifecycle.