Add sponsors information

README.md

@@ -4,6 +4,28 @@
 
 > Simple, lightweight model-based validation for Vue.js
 
+## Sponsors
+
+<a href="https://github.com/users/shentao/sponsorship" target="_blank">
+  <img src="https://cdn.discordapp.com/attachments/491313387129667594/602524047145828380/68747470733a2f2f6665726f73732e6f72672f696d616765732f737570706f72746572732f67697468756273706f6e736f72.png" alt="NativeScript" width="240px">
+</a>
+
+### Silver
+
+<p align="center">
+  <a href="https://www.nativescript.org/vue?utm_source=vuejsnewsletter&utm_medium=email&utm_campaign=nativescript-awareness" target="_blank">
+    <img src="https://cdn.discordapp.com/attachments/491313387129667594/602523039229542400/nativescript-logo.png" alt="NativeScript" width="170px">
+  </a>
+</p>
+
+### Bronze
+
+<p align="center">
+  <a href="https://www.vuemastery.com/" target="_blank">
+    <img src="https://cdn.discordapp.com/attachments/258614093362102272/557267759130607630/Vue-Mastery-Big.png" alt="Vue Mastery logo" width="180px">
+  </a>
+</p>
+
 ### Features & characteristics:
 * Model based
 * Decoupled from templates