fix some bug and update document

app.ts

@@ -4,6 +4,7 @@
 * จะใช้ Node.js เป็น reverse proxy ไปหา pandoc ที่ swan ขึ้นมา
 * demo frontent อยู่ในโฟลเดอร์ public
 */
+import cors from "cors"
 import swaggerspecs from "./libs/swagger-specs.json"
 import swaggerUi from "swagger-ui-express"
 import express, { Express, Request, Response } from 'express'
@@ -12,6 +13,7 @@ import { xlsxTemplateRoute } from './libs/xlsx-template-lib'
 import { convertTemplateRoute } from './libs/convert-libs'
 const app: Express = express()
 const port: number = Number(process.env.PORT) || 80;
+app.use(cors());
 app.use(express.json()); //‘application/json’ 
 app.use(express.raw()); //‘application/octet-stream’ 
 app.use(express.urlencoded({ extended: true }));