API Reference docs update

docs/api/wang_set.rst

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+.. _wang_set_api:
+Wang Set
+========
+
+This module contains a number of classes related to Wang Sets.
+
+Wang Sets are the underlying data used by Tiled's terrain system. It is unlikely this module will
+ever need touched for creating an implementation in a game engine. It is primarily data used by the
+editor during map creation.
+
+See `Tiled's docs about terrain <https://doc.mapeditor.org/en/stable/manual/terrain/>`_
+and also the `TMX Reference <https://doc.mapeditor.org/en/stable/reference/tmx-map-format/#wangsets>`_
+and the `JSON Reference <https://doc.mapeditor.org/en/stable/reference/json-map-format/#wang-set>`_
+
+WangSet
+^^^^^^^
+
+.. autoclass:: pytiled_parser.wang_set.WangSet
+
+WangColor
+^^^^^^^^^
+
+.. autoclass:: pytiled_parser.wang_set.WangColor
+
+WangTile
+^^^^^^^^
+
+.. autoclass:: pytiled_parser.wang_set.WangTile