Update README.md

README.md

@@ -69,6 +69,32 @@ If you are interested in how data structures are implemented, check out [Lago](h
 
 There are no formal contributing guidelines at the moment as things are still in flux and we might find a better approach to structure content as we go along. You are welcome to contribute whatever you think will be helpful to fellow engineers. If you would like to contribute content for different domains, feel free to create an issue or submit a pull request and we can discuss further.
 
+### Contributors
+
+This project exists thanks to all the people who contributed. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/yangshun/tech-interview-handbook/graphs/contributors"><img src="https://opencollective.com/tech-interview-handbook/contributors.svg?width=890&button=false" /></a>
+
+### Backers
+
+Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/tech-interview-handbook#backer)]
+
+<a href="https://opencollective.com/tech-interview-handbook#backers" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/backers.svg?width=890"></a>
+
+### Sponsors
+
+Support this project by becoming a sponsor. Your logo/profile picture will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/tech-interview-handbook#sponsor)]
+
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/0/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/0/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/1/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/1/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/2/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/2/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/3/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/3/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/4/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/4/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/5/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/5/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/6/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/6/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/7/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/7/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/8/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/8/avatar.svg"></a>
+<a href="https://opencollective.com/tech-interview-handbook/sponsor/9/website" target="_blank"><img src="https://opencollective.com/tech-interview-handbook/sponsor/9/avatar.svg"></a>
+
 ## Maintainers
 
 * [Yangshun Tay](https://github.com/yangshun)