docs: update README.md [skip ci]

Author: allcontributors[bot]

README.md

@@ -1,4 +1,7 @@
 # Code Capsule App
+<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 This repository hosts the code for a Graasp app that lets users write code reviews, edit and annotate code, alone or in collaboration.
 
@@ -11,3 +14,25 @@ This repository hosts the code for a Graasp app that lets users write code revie
 ### How to bootstrap your app and set every tool you need
 
 Please have a look at the documentation to [start your app and setup all necessary tools](docs/SETUP.md).
+
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tbody>
+    <tr>
+      <td align="center"><a href="https://github.com/spaenleh"><img src="https://avatars.githubusercontent.com/u/39373170?v=4?s=100" width="100px;" alt="Basile Spaenlehauer"/><br /><sub><b>Basile Spaenlehauer</b></sub></a><br /><a href="https://github.com/graasp/graasp-app-code-capsule/commits?author=spaenleh" title="Code">💻</a> <a href="#ideas-spaenleh" title="Ideas, Planning, & Feedback">🤔</a> <a href="#research-spaenleh" title="Research">🔬</a> <a href="https://github.com/graasp/graasp-app-code-capsule/commits?author=spaenleh" title="Tests">⚠️</a></td>
+    </tr>
+  </tbody>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!