add readme image

Author: Pothulapati

README.md

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 # terraform-provider-dfcloud
 
+<p align="center">
+  <a href="https://dragonflydb.io">
+    <img  src="/.github/images/logo-full.svg"
+      width="284" border="0" alt="Dragonfly">
+  </a>
+</p>
+
 Dragonfly Cloud terraform provider is a terraform provider for managing resources in [Dragonfly Cloud](https://dragonflydb.cloud/).
 
 This provider is currently in *beta*. Feel free to try it out and provide feedback through issues.