add some samples

samples/folding-test.lua

@@ -0,0 +1,11 @@
+function on_resume()
+    ui:show_lines({ "One", "Two", "Three" }, nil, "Folded")
+end
+
+function on_click(idx)
+    if idx == 0 then
+        ui:show_toast("Folded")
+    else
+        ui:show_toast("Not folded")
+    end
+end