add js script "Notify" (#802)

repo/js/Notify/main.js

@@ -0,0 +1,3 @@
+(async function () {
+    notification.Send(settings.content);
+})();

repo/js/Notify/manifest.json

@@ -0,0 +1,8 @@
+{
+  "manifest_version": 1,
+  "name": "发送通知",
+  "version": "1.0",
+  "description": "发送通知，可以在调度器中使用。",
+  "settings_ui": "settings.json",
+  "main": "main.js"
+}

repo/js/Notify/settings.json

@@ -0,0 +1,8 @@
+[
+    {
+        "name": "content",
+        "type": "input-text",
+        "label": "通知内容",
+        "default": "请前往 JS脚本自定义设置 中修改内容。"
+    }
+]