images/README.md

These images are freely-usable ones from Unsplash and public domain:

• https://unsplash.com/photos/rDEOVtE7vOs
• https://unsplash.com/photos/et_78QkMMQs
• https://unsplash.com/photos/ILip77SbmOE
• https://unsplash.com/photos/95UF6LXe-Lo
• https://www.pexels.com/photo/children-with-her-students-holding-different-color-bells-8535230/