Feature: New Debianet app

[webmaster442]

• Main menu has an entry to display readme contents
• Main menu has an entry for .NET tool installation, so that the official installer would only ship with the debianet tool
• Debianet tool is distributed as a NuGet package and is installed from official NuGet
• Main menu has an entry called system info that would display system information, similarly to neofetch, so that neofetch wouldn't need to be part of distribution
• Main menu has a command for interacting with docker
  • List running containers
  • List all containers
  • List images