Update README.md

README.md

@@ -3,4 +3,12 @@ rqt_dynamic_graph
 
 Rqt plug-in allowing to embed a dynamic-graph python interpreter.
 
-![RQT dynamic-graph](doc/rqt_dynamic_graph.jpg)
\ No newline at end of file
+This replaces the `run_command` script from `dynamic_graph_bridge` to
+provide an unified working environment.
+
+![RQT dynamic-graph](doc/rqt_dynamic_graph.jpg)
+
+
+**Caution:** two kind of Python consoles are supported (classic or
+  Spyderlib). The second one is still work in progress and should be
+  used with caution.