added a quickstart document to help installing at the right place

QuickStart.md

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+# Instructions for the SupperCollider version of the fluid.decomposition toolbox
+
+## How to start:
+
+1) move the full fluid_decomposition folder in your Extensions folder (see the 'Using Extensions' Guide in the documentation), and restart SuperCollider.
+
+There is a Guide giving the overview of the toolbox. Full documentation, and examples, are also available.
+
+#### Enjoy!