Add a README

README.md

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+# gPH
+The Process Hitting is a recently introduced formalism suited for modelling qualitative dynamics of biological networks. It is a special class of Asynchronous Automata Networks.
+
+**gPH** is a graphical interface for editing Process Hitting models.
+
+[Pint](https://github.com/pauleve/pint/) implements the language, simulation, formal analysis, and translation of Process Hitting models.
+
+![screenshot gPH](http://loicpauleve.name/pint/images/gPH.png)
+
+## Dependencies
+### Compile-time
+ * qt5
+ * boost
+ * graphviz
+
+### Run-time
+ * phc, from [Pint](https://github.com/pauleve/pint/)