add sponsors to docs

Author: kazupon

README.md

@@ -7,6 +7,72 @@
 
 Vue CLI plugin to add vue-i18n to your Vue Project
 
+<h2 align="center">🤝 Supporting Intlify Project</h2>
+
+Intlify Project is an open source project that is included Vue I18n and i18n tooling and libralies with its ongoing development made possible entirely by the support of Sponsors. If you would like to become a sponsor, please consider:
+
+<p align="center">
+  <a
+    href="https://github.com/sponsors/kazupon"
+    target="_blank">
+    Become a Sponsor on GitHub
+  </a>
+</p>
+
+<h3 align="center">🥇 Gold Sponsors</h3>
+
+<p align="center">
+  <a
+    href="https://nuxtjs.org/"
+    target="_blank">
+    <img
+      src="https://raw.githubusercontent.com/intlify/vue-i18n-next/master/docs/public/nuxt.png"
+      width="240px"
+    />
+  </a>
+</p>
+
+<h3 align="center">🥈 Silver Sponsors</h3>
+
+<p align="center">
+  <a
+    href="https://www.codeandweb.com/babeledit?utm_campaign=vue-i18n-2019-01" 
+    target="_blank">
+    <img
+      src="https://secure.codeandweb.com/static/babeledit.svg"
+      width="200px"
+    />
+  </a>
+</p>
+
+<h3 align="center">🥉 Bronze Sponsors</h3>
+
+<p align="center">
+  <a href="https://zenarchitects.co.jp/" target="_blank">
+    <img
+      src="https://raw.githubusercontent.com/intlify/vue-i18n-next/master/docs/public/zenarchitects.png"
+      width="144px"
+    />
+  </a>
+</p>
+<p align="center">
+  <a href="https://www.sendcloud.com/" target="_blank">
+    <img
+      src="https://raw.githubusercontent.com/intlify/vue-i18n-next/master/docs/public/sendcloud.png"
+      width="144px"
+    />
+  </a>
+</p>
+<p align="center">
+  <a href="https://www.vuemastery.com/" target="_blank">
+    <img
+      src="https://raw.githubusercontent.com/intlify/vue-i18n-next/master/docs/public/vuemastery.png"
+      width="144px"
+    />
+  </a>
+</p>
+
+<br/>
 
 ## :star: Features
 - [vue-i18n](https://github.com/kazupon/vue-i18n) basic scaffolding