feat: better readme

README.md

@@ -1,5 +1,24 @@
 # ClientServer
 
+A Java-based ☕️↔️ UDP client-server chat 💬 system with automatic 🔄 text-to-emoji 😊 conversion using Mistral API.
+
+## Features
+
+### Available Commands
+
+- `/list` : Display connected clients list
+- `/msg <nickname> <message>` : Send private message to specific client
+- `/help` : Display help with all available commands
+- `/disconnect` : Clean server disconnection
+- `<message>` : Broadcast message translated to emojis to all connected clients
+
+### Technical Features
+
+- UDP Communication
+- Multi-threading for client handling
+- Mistral API for text-to-emoji conversion
+- Disconnection handling
+
 ## Build
 
 ```bash
@@ -11,33 +30,76 @@
 ### Client
 
 ```bash
-./gradlew run --args='client'
+./gradlew runClient
 ```
 
-or
-
-```bash
-./gradlew runServer
-```
+The client will ask for a pseudo, an IP (type `localhost` if server and clients are on the same machine), and a port (type `6666` by default).
 
 ### Server
 
-```bash
-./gradlew run --args='server'
-```
-
-or
-
 ```bash
 ./gradlew runServer
 ```
 
+## Configuration
+
+Create a `config.properties` file at project root (`ClientServer/app/config.properties`) with:
+
+```properties
+mistral.api.key=your_api_key
+```
+
+Replace `your_api_key` with your actual Mistral API key. Create one for free at https://console.mistral.ai/api-keys. If no API key is provided, the server will not be able to convert broadcasted messages to emojis and empty broadcasted messages will be sent.
+
 ## Documentation
 
+### Sequence Diagram
+
 ```mermaid
 sequenceDiagram
-    Note over Client, Serveur: DatagramSocket("localhost", 66666)
-    Client->>+Serveur: DatagramPacket("Salve !", 7, "localhost", 6666)
-    Note over Serveur, Client: DatagramSocket("localhost", 66666)
-    Serveur->>+Client: DatagramPacket("Accusé de réception", 19, "localhost", 6666)
+    participant MainServer
+
+    participant Alice
+    Note over Alice: Creates DatagramSocket
+    Alice->>+MainServer: Sends username "Alice"
+    Note over MainServer: Creates new socket<br/>for AliceHandler
+    create participant AliceHandler
+    MainServer->>AliceHandler: Create new handler thread
+    MainServer->>-Alice: PORT:{AlicePort}
+
+    participant Bob
+    Bob->>+MainServer: Sends username "Bob"
+    Note over MainServer: Creates new socket<br/>for BobHandler
+    create participant BobHandler
+    MainServer->>BobHandler: Create new handler thread
+    MainServer->>-Bob: PORT:{BobPort}
+
+    rect rgb(200, 200, 255)
+        Note over Alice,Bob: Chat loop
+        Alice->>+AliceHandler: "Hi everyone!"
+        Note over AliceHandler: Converts to emojis
+        AliceHandler->>+BobHandler: Broadcast message
+        BobHandler->>-Bob: "Alice: 👋👩‍👩🌍🎉"
+        AliceHandler->>-Alice: Message sent
+
+        Bob->>+BobHandler: "Hello Alice, how are you?"
+        Note over BobHandler: Converts to emojis
+        BobHandler->>+AliceHandler: Broadcast message
+        AliceHandler->>-Alice: "Bob: 👋🏻👩🏼‍🦰🐰🤔👩🏼‍🦰🐇💬👩🏼‍🦰🐰👍🏻😊👩🏼‍🦰🐇👋🏻"
+        BobHandler->>-Bob: Message sent
+    end
+
+    Alice->>+AliceHandler: /disconnect
+    Note over AliceHandler: Removes Alice<br/>from map
+    AliceHandler->>-Alice: Disconnection confirmation
+    AliceHandler->>MainServer: Thread terminated
+    MainServer-->>AliceHandler: destroy
+
+    Bob->>+BobHandler: /disconnect
+    Note over BobHandler: Removes Bob<br/>from map
+    BobHandler->>-Bob: Disconnection confirmation
+    BobHandler->>MainServer: Thread terminated
+    MainServer-->>BobHandler: destroy
+
+    Note over Alice,Bob: Close sockets
 ```