add(sample): 护眼模式

fix(floaty): xml.toString() return empty when xml has just one node

app/src/main/assets/sample/悬浮窗/护眼模式.js

@@ -0,0 +1,10 @@
+var w = floaty.rawWindow(
+    <frame gravity="center" bg="#44ffcc00"/>
+);
+
+w.setSize(-1, -1);
+w.setTouchable(false);
+
+setTimeout(()=>{
+    w.close();
+}, 60000);