Update README.md

Author: meili-bot

README.md

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 ## Table of Contents <!-- omit in toc -->
 
+- [🎃 Hacktoberfest](#-hacktoberfest)
 - [📖 Documentation](#-documentation)
 - [🔧 Installation](#-installation)
 - [🚀 Getting Started](#-getting-started)
 - [🤖 Compatibility with Meilisearch](#-compatibility-with-meilisearch)
 - [💡 Learn More](#-learn-more)
 - [⚙️ Development Workflow and Contributing](#️-development-workflow-and-contributing)
 
+## 🎃 Hacktoberfest
+
+It’s Hacktoberfest 2022 @Meilisearch
+
+[Hacktoberfest](https://hacktoberfest.com/) is a celebration of the open-source community. This year, and for the third time in a row, Meilisearch is participating in this fantastic event.
+
+You’d like to contribute? Don’t hesitate to check out our [contributing guidelines](./CONTRIBUTING.md).
+
 ## 📖 Documentation
 
 See our [Documentation](https://docs.meilisearch.com/learn/tutorials/getting_started.html) or our [API References](https://docs.meilisearch.com/reference/api/).