More text in README

README.md

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 A simple tool for visualising OSPF network topology as seen by BIRD
 ====
 
-<!-- TODO: write more… -->
+This is a tool to visualize current state of the OSPF network and compare it to
+a reference / expected state.
+
+
+## Installation
+
+Run `pip install -e .`. You can use a virtualenv if you wish (recommended).
+
+A demo is located in `./poor_mans_visualisation.py`, if that runs, everything
+should be working.