Added Traditional Chinese language pack (#83)

* Create zhtw.ts

* Update index.ts

* Update README.md for Added Traditional Chinese language pack

frontend/src/locales/index.ts

@@ -2,7 +2,7 @@ import { createI18n } from 'vue-i18n'
 import en from './en'
 import fa from './fa'
 import zhcn from './zhcn'
-
+import zhtw from './zhtw'
 
 export const i18n = createI18n({
   legacy: false,
@@ -11,7 +11,8 @@ export const i18n = createI18n({
   messages: {
     en,
     fa,
-    zhcn
+    zhcn,
+    zhtw
   },
 })
 
@@ -19,4 +20,5 @@ export const languages = [
   { title: 'English', value: 'en' },
   { title: 'فارسی', value: 'fa' },
   { title: '简体中文', value: 'zhcn' },
+  { title: '繁體中文', value: 'zhtw' },
 ]