Added hello-go example to make example image faster.

examples/hello-ruby/README.md

@@ -0,0 +1,23 @@
+This is a worker that just echoes the "input" param in the payload.
+
+eg:
+
+This input:
+
+```json
+{
+  "name": "Johnny Utah"
+}
+```
+
+Will output:
+
+```
+Hello Johnny Utah!
+```
+
+## Try it
+
+```
+echo '{"name":"Johnny"}' | docker run --rm -i iron/hello
+```