added index.md and three png files

[amandalin047]

Closes # .

Changes proposed in this pull request:

[lunebellec]

The project is looking good, but it is missing all the meta data.

Please add the header for the document, adapting from the project template: https://raw.githubusercontent.com/school-brainhack/school-brainhack.github.io/main/content/en/project/template/index.md

Also please add a cover image for your project, which you can link with the image field in the header.

[lunebellec]

So sorry this took SOOO long :( LGTM, merging.