init for README only

README.md

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+This Git repository contains the **~300** metro stations from Paris, thanks to RATP Open Data.
+
+You can visualize the result in many ways, for example:
+- GitHub network view: https://github.com/vbarbaresi/MetroGit/network
+![GitHub network view](http://i.imgur.com/jV8e2Cx.png)
+
+- `gitk` on your local copy
+![gitk view](http://i.imgur.com/T1I7GWX.png)
+
+- `git log --all --graph` (+ your favorite **decorate** options)
+![git --graph view](http://i.imgur.com/x18oj9l.png)
+
+Each metro line is represented by a **branch**.
+
+A **commit** corresponds to a station. All commits are empty (with `--allow-empty` option), there is only metadata in this repository (and this `README` file)
+
+A **merge** is a connection between one or more lines (use of `octopus` merges for interconnections of 3 and more)
+
+This is the first version, I had to remove some interconnections, because there were some cycles.
+In a second version I would dig more deeply and try to remove the least possible connections.
+In a third version I would add **Tramway** stations, **RER** stations (**Réseau Express Régional**), and ultimately Bus stations!
+
+There are still some errors / incorrect merges left.