new hello world example

examples/simple/hello_world_topology.rb

@@ -0,0 +1,22 @@
+require 'red_storm'
+
+class HelloWorldSpout < RedStorm::SimpleSpout
+  on_init {@words = ["hello", "world"]}
+  on_send {@words.shift unless @words.empty?}
+end
+
+class HelloWorldBolt < RedStorm::SimpleBolt
+  on_receive :emit => false do |tuple|
+    log.info(tuple.getString(0))
+  end
+end
+
+class HelloWorldTopology < RedStorm::SimpleTopology
+  spout HelloWorldSpout do
+    output_fields :word
+  end
+
+  bolt HelloWorldBolt do
+    source HelloWorldSpout, :global
+  end
+end