Update item Annotation with polygons in User guide v2#1612

Merged

nmanovic merged 2 commits intocvat-ai:developfrom TOsmanov:UG-update-item-Annotation-with-polygons-v2

May 29, 2020

+77-25

Commits on May 28, 2020

update user_guide.md
timurx.osmanov
committed
update images and gifs
timurx.osmanov
committed