docs: add contributors and documentation (#7112)

CONTRIBUTORS.md

@@ -0,0 +1,21 @@
+# Contributors
+
+Thank you to all the wonderful people who have contributed to axios!
+
+## Core Team
+
+- [Jay](https://github.com/jasonsaayman) - Lead Maintainer
+- [Dmitriy Mozgovoy](https://github.com/DigitalBrainJS) - Core Contributor  
+- [Matt Zabriskie](https://github.com/mzabriskie) - Creator
+
+## Notable Contributors
+
+<!-- Add contributors here in alphabetical order by GitHub username -->
+
+## How to Contribute
+
+We welcome contributions! Please see our [Contributing Guide](CONTRIBUTING.md) for details.
+
+---
+
+*This list is manually maintained. If you've contributed and would like to be added, please submit a pull request!*

README.md

@@ -39,6 +39,7 @@
 [![gitter chat](https://img.shields.io/gitter/room/mzabriskie/axios.svg?style=flat-square)](https://gitter.im/mzabriskie/axios)
 [![code helpers](https://www.codetriage.com/axios/axios/badges/users.svg)](https://www.codetriage.com/axios/axios)
 [![Known Vulnerabilities](https://snyk.io/test/npm/axios/badge.svg)](https://snyk.io/test/npm/axios)
+[![Contributors](https://img.shields.io/github/contributors/axios/axios.svg?style=flat-square)](CONTRIBUTORS.md)