build: Setup building system

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+NSL: NDN Signature Logger
+=========================
+
+NSL is a Logging System that can be used to validate data with long lifetime.
+
+Please submit any bugs or issues to the `NSL issue tracker
+<http://redmine.named-data.net/projects/nsl/issues>`__.
+
+NSL Documentation
+-----------------
+
+.. toctree::
+   :hidden:
+   :maxdepth: 3
+
+   README
+   INSTALL
+   manpages
+
+- :doc:`README`
+
+- :doc:`INSTALL`
+
+- :doc:`manpages`
+
+Documentation for ndn-cxx developers and contributors
++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+- `API documentation (doxygen) <doxygen/annotated.html>`_
+
+License
+-------
+
+NSL is an open source project licensed under conditions of GNU Lesser General Public License.
+For more information about the license, refer to
+`COPYING <https://github.com/named-data/nsl/blob/master/COPYING>`_.
+
+While the license does not require it, we really would appreciate it if
+others would share their contributions to the library if they are
+willing to do so under the same license.