Update welcome 2025

READM.md

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+<p align="center">
+  <a href="https://github.com/tchapgouv">
+    <img alt="tchap-logo" src="/assets/tchap-logo.svg" width="300" />
+  </a>
+</p>
+
+<p align="center">
+Welcome to Tchap! The french public sector instant messaging system
+</p>
+
+<p align="center">
+  <a href="https://tchap.numerique.gouv.fr">
+    Presentation website
+  </a> - <a href="#getting-started-">
+    Getting started
+  </a> - <a href="[email protected]">
+    Reach out
+  </a>
+</p>
+
+<img src="/docs/assets/docs_live_collaboration_light.gif" width="100%" align="center"/>
+
+## Getting started 🔧
+
+### The clients
+The tchap clients are based on [element](https://github.com/element-hq) project: 
+
+** Web **
+A react typescript based project, using libraries like [matrix-js-sdk](https://github.com/matrix-org/matrix-js-sdk) and [matrix-rust-sdk](https://github.com/matrix-org/matrix-rust-sdk): 
+- https://github.com/tchapgouv/tchap-web-v4
+
+** Android **
+There are two android mobile application available :
+- The legacy: https://github.com/tchapgouv/tchap-android
+- The new: https://github.com/tchapgouv/tchap-x-android
+
+** iOS ** 
+- The legacy: https://github.com/tchapgouv/tchap-ios
+- The new: https://github.com/tchapgouv/tchap-x-ios
+
+### The backend
+Our backend is based on [synapse](https://github.com/element-hq/synapse), in which we added a list of modules and customisations : https://github.com/tchapgouv/tchap-backend/wiki#modules-utilis%C3%A9s
+
+
+### The infrastructure 
+Based on terraform and ansible to deploy our infrastructre
+
+
+## Roadmap
+
+- Want to know where the project is headed? [🗺️ Checkout our roadmap](https://tchap.numerique.gouv.fr/feuille-de-route/)
+
+- To have a day to day visualization of our team backlog and tickets. You can checkout the [github roadmap](https://github.com/orgs/tchapgouv/projects/15)