update readme

diff --git a/README.md b/README.md
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@@ -41,6 +41,10 @@
 - [Dynamic binding system](https://github.com/jpbruyere/Crow/wiki/The-binding-system)
 - SVG rendering (with [rsvg library](https://developer.gnome.org/rsvg/))
 
+#### Status
+
+**C.R.O.W.** is in beta development state, api could change.
+
 #### Documentation
 * [Introduction](https://github.com/jpbruyere/Crow/wiki)
 * [Classes documentation autogenerated from doxygen](https://github.com/jpbruyere/Crow/wiki/index)