docs: readme dopt sponsor

Author: gabrieljablonski

README.md

@@ -64,6 +64,12 @@ yarn add react-tooltip
 
 React Tooltip is proud to be sponsored by [Frigade](https://frigade.com/?source=react-tooltip), a developer tool for building better product onboarding: guided tours, getting started checklists, announcements, etc.
 
+<a href="https://dopt.com/?source=react-tooltip">
+  <img alt="Frigade" style="height: 250px" src="docs/static/img/sponsors/dopt.png" />
+</a>
+
+[Dopt](https://dopt.com/?source=react-tooltip) gives developers UI components and SDKs to build seamless onboarding and education experiences in minutes.
+
 ## Usage
 
 1 . Import the CSS file to set default styling.