added files for installation on pypi from github

installation.rst

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+pandapower combines the data analysis library `pandas <http://pandas.pydata.org>`_ and the power flow solver `PYPOWER <https://pypi.python.org/pypi/PYPOWER>`_ to create an easy to use network calculation program
+aimed at automation of analysis and optimization in power systems.
+
+pandapower is a joint development of the research group Energy Management and Power System Operation, University of Kassel and the Department for Distribution System
+Operation at the Fraunhofer Institute for Wind Energy and Energy System Technology (IWES), Kassel.
+
+For more information, go to `<http://www.uni-kassel.de/go/pandapower>`_.
+
+Installation
+==============
+To install pandapower, simply use: ::
+
+    pip install pandapower
+
+This will install the following dependencies:
+    - pypower>=5.0.1
+    - numpy>1.8
+    - pandas
+    - networkx
+
+To use all of pandapowers functionalites, you will need the following additional packages:
+    - numba>=0.25.0 (for accelerated loadflow calculation)
+    - matplotlib (for plotting)
+    - python-igraph (for plotting networks without geographical information)
+    - xlrd (for loading/saving files from/to excel)
+    - openpyxl (for loading/saving files from/to excel)

setup.cfg

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+[metadata]
+description-file = installation.rst
+license_file = LICENSE