e-learning: "parasite or not" activity

[pierrepo]

• [ ] Select a random image with a least 3 parasites and 3 other annotations
• [x] Display the image
• [x] Display two counters: correct / error
• [x] Display an annotation at random + two buttons "parasites" / "not parasite"
• [ ] Start a timer for 5 seconds and ask the user to click on the correct button.
• [x] Display two counters: correct / error
• [x] Update the counter accordingly to the user show
• [x] Process all image annotation (and clean the previous annotation on the image each time)
• [ ] At the end, propose to play with another image or to quit (Go back to e-learning activities or to home page)