add qr-code install instructions

src/main.ts

@@ -1,4 +1,5 @@
 import { createApp } from 'vue'
+import { VueQueryPlugin } from '@tanstack/vue-query'
 import { createPinia } from 'pinia'
 import PouchDB from 'pouchdb-browser'
 
@@ -31,6 +32,9 @@ import router from './router'
 
 const app = createApp(App)
 
+app.use(VueQueryPlugin, {
+  enableDevtoolsV6Plugin: import.meta.env.DEV,
+})
 app.use(createPinia())
 app.use(router)
 app.use(PrimeVue, {