[WIP] Add C++ bindings

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+Nodes
+=====
+
+.. default-domain:: cpp
+.. highlight:: cpp
+.. namespace:: serd
+
+Nodes are the basic building blocks of data.
+Nodes are essentially strings,
+but also have a :enum:`type <NodeType>`,
+and optionally either a datatype or a language.
+
+In the abstract, a node is either a literal, a URI, or blank.
+Serd also has a type for variable nodes,
+which are used for some features but not present in RDF data.
+
+Construction
+------------
+
+Several convenient construction functions are provided that return nodes:
+
+- :func:`make_token`
+- :func:`make_uri`
+- :func:`make_file_uri`
+- :func:`make_literal`
+- :func:`make_boolean`
+- :func:`make_decimal`
+- :func:`make_double`
+- :func:`make_float`
+- :func:`make_integer`
+- :func:`make_base64`
+
+Accessors
+---------
+
+The datatype or language of a node can be retrieved with :func:`~NodeWrapper::datatype` or :func:`~NodeWrapper::language`, respectively.
+Note that only literals can have a datatype or language,
+but never both at once.