🎨 feat(stirling-pdf): Add YouTube video and docker-compose config (#850)

Adds a new README.md file with a link to a YouTube video and a
docker-compose.yml file that defines the configuration for the
big-bear-stirling-pdf application. The docker-compose file includes
environment variables for configuring the Stirling PDF application,
such as enabling security, login, and CSRF protection, as well as
setting the default locale and enabling advanced PDF conversion
features.

how-to-install-stirling-pdf-on-dockge/README.md

@@ -0,0 +1 @@
+## YouTube Video

how-to-install-stirling-pdf-on-dockge/docker-compose.yml

@@ -0,0 +1,59 @@
+# Service definitions for the big-bear-stirling-pdf application
+services:
+  # Main service configuration for the Stirling PDF application
+  # This service provides a web interface running on port 8080 for PDF editing
+  big-bear-stirling-pdf:
+    # Name of the container
+    container_name: big-bear-stirling-pdf
+
+    # Image to be used for the container specifies the stirling-pdf version and source
+    image: stirlingtools/stirling-pdf:0.37.1
+
+    # Container restart policy - restarts the container unless manually stopped
+    restart: unless-stopped
+
+    # Environment variables for service configuration
+    environment:
+      # Set to true to download security jar (required for authentication login)
+      - DOCKER_ENABLE_SECURITY=false
+
+      # Set to true to enable login for authentication
+      - SECURITY_ENABLE_LOGIN=true
+
+      # Set the initial admin username
+      - SECURITY_INITIALLOGIN_USERNAME=bigbear
+
+      # Set the initial admin password
+      - SECURITY_INITIALLOGIN_PASSWORD=4500733e-a0f8-4605-a712-fd267404956a
+
+      # Set to true to enable CSRF protection
+      - CSRF_DISABLED=false
+
+      # Set the default locale for the application
+      - DEFAULT_LOCALE=en-US
+
+      # Download Calibre onto Stirling-PDF to enable PDF to/from book and advanced HTML conversion
+      - INSTALL_BOOK_AND_ADVANCED_HTML_OPS=false
+
+      # Define custom font libraries to install for document conversions
+      - LANGS=en_US
+
+    # Volume mappings for persistent storage and configuration
+    # These mounts allow the container to interact with the host system
+    volumes:
+      # Required for monitoring system resources and container metrics
+      - big_bear_stirling_pdf_tessdata:/usr/share/tessdata # Required for extra OCR languages
+      - big_bear_stirling_pdf_configs:/configs
+
+    # Map port 8080 on the host to port 8080 on the container
+    ports:
+      - "8080:8080"
+
+# Volumes for the Stirling PDF service
+volumes:
+  big_bear_stirling_pdf_tessdata:
+    name: big_bear_stirling_pdf_tessdata
+    driver: local
+  big_bear_stirling_pdf_configs:
+    name: big_bear_stirling_pdf_configs
+    driver: local