Add first docs template

docs/api-reference/index.rst

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+.. _api_reference:
+
+API reference
+=============
+
+List of all the modules:
+
+.. toctree::
+	:maxdepth: 2
+
+	lwbtn
+	lwbtn_opt

docs/api-reference/lwbtn.rst

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+.. _api_lwbtn:
+
+LwBTN
+=====
+
+.. doxygengroup:: LWBTN
+	:inner:

docs/api-reference/lwbtn_opt.rst

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+.. _api_lwbtn_opt:
+
+Configuration
+=============
+
+This is the default configuration of the middleware.
+When any of the settings shall be modified, it shall be done in dedicated application config ``lwbtn_opts.h`` file.
+
+.. note::
+	Check :ref:`getting_started` for guidelines on how to create and use configuration file.
+
+.. doxygengroup:: LWBTN_OPT
+	:inner: