creaded correct docker image creation file

DOCKER.md

@@ -1,5 +1,14 @@
 # Docker Deployment Guide
 
+## Overview
+
+DigiServer v2 Docker image features:
+- **Base image size**: ~400MB (optimized)
+- **Full HD media support**: Images, videos, PDFs
+- **Optional LibreOffice**: Install on-demand for PPTX support (+500MB)
+- **Auto-initialization**: Database and admin user created on first run
+- **Non-root user**: Runs as `appuser` (UID 1000) for security
+
 ## Quick Start
 
 ### 1. Build and Run with Docker Compose
@@ -171,6 +180,24 @@ docker-compose exec digiserver bash
 docker exec -it digiserver bash
 ```
 
+### Installing Optional Dependencies
+
+**LibreOffice for PowerPoint Support:**
+
+```bash
+# Method 1: Via Web UI (Recommended)
+# Navigate to Admin Panel → System Dependencies
+# Click "Install LibreOffice" button
+
+# Method 2: Via Docker exec
+docker exec -it digiserver bash
+sudo /app/install_libreoffice.sh
+exit
+
+# Verify installation
+docker exec digiserver libreoffice --version
+```
+
 ## Troubleshooting
 
 ### Port Already in Use
@@ -210,10 +237,15 @@ docker-compose up -d
 
 ## System Requirements
 
+### Base Image
 - Docker 20.10+
 - Docker Compose 2.0+
-- 2GB RAM minimum
-- 10GB disk space for media files
+- 1GB RAM minimum (2GB recommended)
+- 5GB disk space (base + uploads)
+
+### With LibreOffice (Optional)
+- 2GB RAM recommended
+- 10GB disk space (includes LibreOffice + media)
 
 ## Security Recommendations