List Nuxt3 install instructions in readme

[polyclick]

Hi

Would be great to put the install instructions for with nuxt3 in the readme. Took me a bit to figure it out ;)

• Create file: /plugins/VueDataTable.plugin.ts
• Use following code to register the plugin

// plugins/VueDataTable.plugin.ts
import { defineNuxtPlugin } from '#app'
import VueDataTable from '@uwlajs/vue-data-table'
import '@uwlajs/vue-data-table/dist/style.css'

export default defineNuxtPlugin(nuxtApp => {
  nuxtApp.vueApp.use(VueDataTable)
})

Nuxt3 will register the component automatically, with the default styling. Use it with tag: <vue-data-table></vue-data-table>

Cheers!