Update README with message endpoints documentation

README.md

@@ -75,6 +75,27 @@ Apply migrations:
 alembic upgrade head
 ```
 
+## API Endpoints
+
+### Messages API
+
+- **GET /api/v1/messages**
+  - Retrieves a list of all messages
+  - Supports pagination and filtering
+
+- **GET /api/v1/messages/{message_id}**
+  - Retrieves a specific message by ID
+
+- **POST /api/v1/messages**
+  - Creates a new message
+  - Requires message content and recipient information
+
+- **PUT /api/v1/messages/{message_id}/read**
+  - Marks a message as read
+
+- **DELETE /api/v1/messages/{message_id}**
+  - Deletes a specific message
+
 ## Environment Variables
 
 None required for basic setup, as SQLite database path is configured internally.