Update desktop entry and license file

- Improve desktop entry with proper localization and metadata
- Rename LICENCE to LICENSE for consistency
- Update README content

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Debian Gaming Deployment Tool.desktop

@@ -1,20 +1,23 @@
 [Desktop Entry]
-Categories=Game;System;
-Comment[fr_CH]=Script d'installation gaming avec interface graphique pour Debian
-Comment=Script d'installation gaming avec interface graphique pour Debian
-Exec=/home/sky/Documents/Documents_Philippe_Favre/gitea/debian_gaming_deployment_tool/install_gaming.sh
-GenericName[fr_CH]=
-GenericName=
-Icon=applications-games
-Keywords=gaming;installation;debian;steam;wine;lutris;
-MimeType=
-Name[fr_CH]=Debian Gaming Deployment Tool
-Name=Debian Gaming Deployment Tool
-Path=
-StartupNotify=true
-Terminal=false
-TerminalOptions=
-Type=Application
 Version=1.0
+Type=Application
+Name=Debian Gaming Deployment Tool
+Name[fr]=Outil de Déploiement Gaming Debian
+Name[fr_CH]=Outil de Déploiement Gaming Debian
+Comment=Gaming installation script with GUI for Debian
+Comment[fr]=Script d'installation gaming avec interface graphique pour Debian
+Comment[fr_CH]=Script d'installation gaming avec interface graphique pour Debian
+GenericName=Gaming Setup Tool
+GenericName[fr]=Outil de Configuration Gaming
+GenericName[fr_CH]=Outil de Configuration Gaming
+Exec=/usr/bin/install_gaming.sh
+Icon=applications-games
+Terminal=false
+StartupNotify=true
+Categories=Game;System;Utility;
+Keywords=gaming;installation;debian;steam;wine;lutris;setup;
+MimeType=
+StartupWMClass=Debian Gaming Deployment Tool
+X-GNOME-UsesNotifications=true
 X-KDE-SubstituteUID=false
-X-KDE-Username=
+X-Desktop-File-Install-Version=0.26