add broadcast ui example

src/main/example/core.clj

@@ -16,6 +16,9 @@
     (u/patch-signals-edn! sse {:msg (subs message 0 (inc i))})
     (Thread/sleep 500)))
 
+(defaction say-hi [sse_]
+  (u/broadcast-signals! {:msg "hello from the great beyond!"}))
+
 ;; pages
 (defpage home-page
    (html->str
@@ -31,7 +34,12 @@
 (defpage page-2
   (html->str
     [:main
+     [:div
      [:p "this is page2"]
+     [:button 
+      {:data-on-click  (->expr (@post ~say-hi))}
+      "say hi to everyone"]]
+
      [:button {:data-on-click (->expr (@post ~home-page))}
       "go back to home"]]))