Adding images of all the contributors in this project (open-telemetry…

…#944)

README.md

@@ -120,6 +120,11 @@ Maintainers ([@open-telemetry/js-maintainers](https://github.com/orgs/open-telem
 
 *Find more about the maintainer role in [community repository](https://github.com/open-telemetry/community/blob/master/community-membership.md#maintainer).*
 
+### Thanks to all the people who already contributed!
+<a href="https://github.com/open-telemetry/opentelemetry-js/graphs/contributors">
+  <img src="https://contributors-img.web.app/image?repo=open-telemetry/opentelemetry-js" />
+</a>
+
 ## Packages
 
 ### API
@@ -192,7 +197,6 @@ Apache 2.0 - See [LICENSE][license-url] for more information.
 
 [node-gitter-url]: https://gitter.im/open-telemetry/opentelemetry-node?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
 [license-url]: https://github.com/open-telemetry/opentelemetry-js/blob/master/LICENSE
-
 [up-for-grabs-issues]: https://github.com/open-telemetry/OpenTelemetry-js/issues?q=is%3Aissue+is%3Aopen+label%3Aup-for-grabs
 [good-first-issues]: https://github.com/open-telemetry/OpenTelemetry-js/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22