Update README.md

README.md

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-# lagoon-plugin-minecraft-java
+<p align="center">
+  <a href="https://lagoon.under-scape.com">
+      <img src="https://cdn.modrinth.com/data/cached_images/16b47fe16787be657d51d829febd191f06d3d619.png" alt="Lagoon logo" width="150">
+        </a>
+        </p>
 
-Plugin to connect your Minecraft server to Lagoon.
+## Presentation
+
+Lagoon plugin is a plugin to use Lagoon Proximity Chat system **and only this system**.
+
+### How it works?
+
+- Download the plugin
+- Install it on your server (paper/purpur/spigot)
+- Restart your server
+- Config the plugin `/plugins/LagoonPlugin/config.yml`
+- Restart your server
+- When players join they obtain a code
+- Enter the code on Lagoon
+- Enjoy!
+
+### Config
+
+```yaml
+room-code="your-lagoon-room-code"
+```
+
+On Lagoon, in your room you will obtain a room code — put it into `room-code`.
+
+> ⚠️ **Warning**  
+> This code only works on Lagoon, don't share it!