Create illustrations for the Qt Creator Manual

The Qt Creator Manual front page and IDE Overview page contain illustrations that could be updated in a similar way to the Qt Design Studio Manual. Most of the illustrations can be shared with the Qt Design Studio Manual, but the following additional illustrations would be needed:

• Coding
• Testing
• Publishing
• In the Getting Started section:
  • IDE Overview
  • Configuring Qt Creator
  • Tutorials

For the current icons, see:

• https://doc.qt.io/qtcreator/index.html 
• https://doc.qt.io/qtcreator/creator-overview.html 
• https://doc.qt.io/qtdesignstudio/index.html
• https://doc.qt.io/qtcreator/creator-getting-started.html