Sphinx-based documentation added

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: