Sphinx-based documentation added

docs/reference/concepts.rst

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+Concepts
+========
+
+.. namespace:: units
+
+.. note::
+
+  All names defined in this chapter reside in the :any:`units` namespace unless specified otherwise.
+
+.. concept:: template<typename T> PrefixType
+
+  Satisfied by all types derived from :class:`prefix_type`.
+
+.. concept:: template<typename T> Prefix
+
+  Satisfied by all instantiations of :class:`prefix`.
+
+.. concept:: template<typename T> Ratio
+
+  Satisfied by all instantiations of :class:`ratio`.
+
+.. concept:: template<typename R> UnitRatio
+
+  Satisfied by all types that satisfy :expr:`Ratio<R>` and for which :expr:`R::num > 0` and :expr:`R::den > 0`.
+
+.. concept:: template<typename T> BaseDimension
+
+  Satisfied by all dimension types derived from instantiation of :class:`base_dimension`.
+
+.. concept:: template<typename T> Exponent
+
+  Satisfied by all instantiations of :class:`exp`.
+
+.. concept:: template<typename T> DerivedDimension
+
+  Satisfied by all dimension types derived from instantiation of :class:`detail::derived_dimension_base`.
+
+.. concept:: template<typename T> Dimension
+
+  Satisfied by all dimension types for which either :expr:`BaseDimension<T>` or :expr:`DerivedDimension<T>` is ``true``.
+
+.. concept:: template<typename T> Unit
+
+  Satisfied by all unit types derived from instantiation of :class:`scaled_unit`.
+
+.. concept:: template<typename U, typename D> UnitOf
+
+  Satisfied by all unit types that satisfy :expr:`Unit<U>`, :expr:`Dimension<D>`, and for which
+  :expr:`U::reference` and :expr:`dimension_unit<D>::reference` denote the same unit type.
+
+.. concept:: template<typename T> Quantity
+
+  Satisfied by all instantiations of :class:`quantity`.
+
+.. concept:: template<typename T> WrappedQuantity
+
+  Satisfied by all wrapper types that satisfy :expr:`Quantity<typename T::value_type>` recursively
+  (i.e. :expr:`std::optional<si::length<si::metre>>`).
+
+.. concept:: template<typename T> Scalar
+
+  Satisfied by types that satisfy :expr:`(!Quantity<T>) && (!WrappedQuantity<T>) && std::regular<T>`.

docs/reference/functions.rst

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+.. note::
+
+  All names defined in this chapter reside in the :any:`units` namespace unless specified otherwise.
+
+Functions
+=========
+
+.. doxygenfunction:: quantity_cast
+
+
+
+Metafunctions
+=============
+
+.. doxygentypedef:: dimension_unit

docs/reference/systems.rst

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+.. note::
+
+  All names defined in this chapter reside in the :any:`units` namespace unless specified otherwise.
+
+Systems
+=======
+
+SI
+--
+
+.. 
+   doxygennamespace:: units::si
+    :members:
+    :undoc-members:
+    :outline:
+
+
+File
+----
+
+.. 
+   doxygenfile:: si/length.h
+
+Group
+-----
+
+.. 
+   doxygengroup:: si_length
+    :content-only:
+    :members:
+    :undoc-members:
+    :outline:

docs/reference/types.rst

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+.. note::
+
+  All names defined in this chapter reside in the :any:`units` namespace unless specified otherwise.
+
+Types
+=====
+
+Quantity
+--------
+
+.. doxygenclass:: units::quantity
+   :members:
+
+.. 
+   :undoc-members:
+
+Dimension
+---------
+
+.. doxygenstruct:: units::base_dimension
+   :members:
+
+.. doxygenstruct:: units::derived_dimension
+   :members:
+
+Unit
+----
+
+.. doxygenstruct:: units::scaled_unit
+   :members:
+
+.. doxygenstruct:: units::unit
+   :members:
+
+.. doxygenstruct:: units::named_unit
+   :members:
+
+.. doxygenstruct:: units::named_scaled_unit
+   :members:
+
+.. doxygenstruct:: units::prefixed_unit
+   :members:
+
+.. doxygenstruct:: units::deduced_unit
+   :members:
+
+Ratio
+-----
+
+.. doxygenstruct:: units::ratio
+   :members: