add readm

examples/twisted/wamp/basic/README.md

@@ -0,0 +1,17 @@
+In a first terminal:
+
+```console
+crossbar start
+```
+
+In a second terminal:
+
+```console
+python client_using_apprunner.py
+```
+
+or
+
+```console
+python client_using_clientservice.py
+```