pyapi DOC basic documentation via sphinx

integrate python docs build in our cmake build system via pyapidoc target.
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+pynetconf2's documentation
+**************************
+
+pynetconf2 is libnetconf2 wrapper module for Python 3, providing the NETCONF client side functionality
+of the library.
+
+.. note::
+   The module compatibles only with Python 3.4 or newer releases.
+
+Features
+========
+
+* Connect to a NETCONF servers via SSH or TLS
+
+Contents
+========
+
+.. toctree::
+   :maxdepth: 3
+
+   api
+   
+Contribution
+============
+
+Any contributions are welcome. If you would like to help in development fork or report issue on the
+project's `GitHub site`_. You can also help in improving the documentation.
+
+.. _github site: https://github.com/CESNET/libnetconf2
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`modindex`
+* :ref:`search`
+