add JSdoc to calendar page

src/pages/calendar/CalendarMain.tsx

@@ -1,6 +1,10 @@
 import React from 'react';
 import ExtensionRoot from '@views/components/common/ExtensionRoot/ExtensionRoot';
 
+/**
+ * Calendar page
+ * @returns entire page
+ */
 export default function CalendarMain() {
     return (
         <ExtensionRoot>