add docdok sponsor

README.md

@@ -71,6 +71,18 @@
   </p>
 </p>
 
+<p align="center">
+  <br/>
+  <a href="https://www.docdok.health/?utm_source=github&utm_medium=react-native-gifted-chat&utm_campaign=sponsorship" target="_blank">
+    <img src="https://www.dropbox.com/s/g4dcq267aqbykpz/logo.png?dl=0&raw=1">
+  </a>
+  <br>
+  <p align="center">Delivering Personalized Healthcare</p>
+  <p align="center">
+    <a href="https://www.docdok.health/?utm_source=github&utm_medium=react-native-gifted-chat&utm_campaign=sponsorship" target="_blank">      Find out more</a>
+  </p>
+</p>
+
 ## Please vote
 **GiftedChat** depends on other packages and some needs a boost, please vote for PRs will improve it, thanks:
 - https://github.com/taskrabbit/react-native-parsed-text/pull/58