Added dummy Clojure class and stopped compiling Clojure examples to get rxjava-clojure JAR generation unblocked

Author: mattrjacobs

language-adaptors/rxjava-clojure/src/examples/clojure/rx/lang/clojure/examples/rx_examples.clj renamed to language-adaptors/rxjava-clojure/src/examples/clojure/rx/lang/clojure/examples/rx_examples.txt

@@ -0,0 +1,6 @@
+(ns rx.lang.clojure.DummyClojureClass)
+
+(defn hello-world [username]
+  (println (format "Hello, %s" username)))
+
+(hello-world "world")