Add images for the Educator Guide.

2021-09-17 17:37:24 +01:00 · 2021-09-17 17:37:24 +01:00 · 5368e1e38f
--- a/images/assessmentanalytics.png
+++ b/images/assessmentanalytics.png
--- a/images/barchart.jpeg
+++ b/images/barchart.jpeg
--- a/images/histogram.jpeg
+++ b/images/histogram.jpeg
--- a/images/selectqbtodownload.png
+++ b/images/selectqbtodownload.png
--- a/images/selectqbtoupload.png
+++ b/images/selectqbtoupload.png