Fix #1012. Half complete example documentation for the IFC Project panel.

Incredibly incomplete, but serves as an example of how reference user-based documentation should be structured.

src/blenderbim/docs/users/general_usage/ifc_project.rst

@@ -0,0 +1,123 @@
+IFC Project
+===========
+
+Overview
+--------
+
+.. container:: location-scene
+
+    |location| Scene Properties |>| IFC Project Info |>| IFC Project
+
+    .. |location| image:: ../../images/location-scene.svg
+    .. |>| image:: ../../images/location-breadcrumb.svg
+
+The IFC Project panel lets you create a new IFC project, load an existing IFC
+project, or view high level project metadata about the currently loaded project.
+
+.. image:: images/ifc-project.png
+
+**IFC Schema**
+   Choose between which IFC schema version to use when creating a new project.
+   IFC4 is recommended for all new projects.
+
+**Unit System**
+   Choose between metric and imperial units of measurement when creating a
+   project.
+
+**Length Unit**
+   Depending on the unit system, choose the default unit to be used for all
+   length measurements. Lengths are used for moving objects around in the 3D
+   scene, as well as lengths, widths, height, and depth quantity take-off data.
+
+**Area Unit**
+   Depending on the unit system, choose the default unit to be used for all
+   area measurements. Areas are typically used for quantity take-off.
+
+**Volume Unit**
+   Depending on the unit system, choose the default unit to be used for all
+   volume measurements. Volumes are typically used for quantity take-off.
+
+**Template**
+   Choose between starting a completely blank project with no objects, or with
+   preloaded object assets (such as wall types, beam types, etc) that you can
+   use immediately. The blank project is recommended for users who want to
+   curate assets, whereas the IFC4 Demo Library is recommended for users wanting
+   to experiment and learn with a basic set of objects.
+
+   This also shows other larger object libraries for steel and countries
+   available with the BlenderBIM Add-on. These contain hundreds of objects and
+   are not recommended to be loaded as a template.
+
+   .. seealso::
+
+      You can start with a blank project and load in more assets later from a
+      library using the IFC Project Library panel.
+
+**Create Project**
+   Create a new project based on the selected settings and template. By default,
+   your project will be created with a basic spatial structure, including a
+   single site, a building, and a single storey within the building.
+
+**Load Project**
+   Load an existing project from an IFC file. The IFC may come from any source,
+   including exported from proprietary BIM software.
+
+Project details
+---------------
+
+Once a project is created, basic metadata about the project will be displayed,
+with basic features to save and unload the project.
+
+.. image:: images/ifc-project-create.png
+
+|FILE| **Filename**
+   Shows the URI of where the IFC is saved, or "No File Found" if the IFC has
+   not yet been saved.
+
+|GREASEPENCIL| **Enable Editing Header**
+   Enable editing basic metadata about the project.
+
+|FILE_CACHE| **IFC Schema**
+   Shows the IFC schema identifier of the model. This cannot be changed while
+   the model is open. It is typically one of IFC2X3, IFC4, or IFC4X3. Other
+   values are not standardised and not supported by the BlenderBIM Add-on.
+
+|FILE_HIDDEN| **IFC MVD**
+   The Model View Definition (MVD) defines the intended purpose of the IFC
+   model. "Design Transfer" is the most advanced MVD, meaning that IFC may be
+   used for native authoring of the model. Other examples include "Reference
+   View" for purely read only geometry (i.e. "dumb geometric model") or
+   "Coordination View" for coordinating models between different disciplines.
+
+   The Design Transfer MVD is used by all BlenderBIM Add-on projects, and is a
+   superset of all other MVDs.
+
+|EXPORT| **Save Project**
+   Saves the current IFC project to a file on disk. Note that this should be
+   used to save the IFC project, *not* the regular Blender ``File > Save`` menu.
+
+|FILE_TICK| **Save Project As**
+   Saves the current IFC project to a file on a disk with a different filename.
+
+Advanced mode
+-------------
+
+.. image:: images/ifc-project-load.png
+
+.. |FILE| image:: ../../images/icon-FILE.svg
+   :class: icon
+
+.. |FILE_CACHE| image:: ../../images/icon-FILE_CACHE.svg
+   :class: icon
+
+.. |FILE_HIDDEN| image:: ../../images/icon-FILE_HIDDEN.svg
+   :class: icon
+
+.. |GREASEPENCIL| image:: ../../images/icon-GREASEPENCIL.svg
+   :class: icon
+
+.. |EXPORT| image:: ../../images/icon-EXPORT.svg
+   :class: icon
+
+.. |FILE_TICK| image:: ../../images/icon-FILE_TICK.svg
+   :class: icon