Added simple Readme

README.md

@@ -0,0 +1,13 @@
+The Acqu Ecosystem
+==================
+
+This repository shall be the common code basis of acqu users within
+the A2 collaboration. It will (at least) cover the calibration and a
+simple physics analysis.
+
+However, this master branch is still under heavy development and many
+changes could break your workflow or personal code. But this will
+improve!
+
+So be warned, but don't hesitate to fork this repo here and contribute
+your personal changes if there useful by providing pull requests.