Add note about handing animations in tests
Add note about handing animations in tests

* Add note about animations

https://pspdfkit.com/blog/2016/running-ui-tests-with-ludicrous-speed/

* Update with kGREYConfigKeyCALayerMaxAnimationDuration

saurabhj80/EarlGrey,sskhandp/EarlGrey,artyom-razinov/EarlGrey,ed-chin/EarlGrey,artyom-razinov/EarlGrey,sskhandp/EarlGrey,google/EarlGrey,artyom-razinov/EarlGrey,ed-chin/EarlGrey,saurabhj80/EarlGrey,google/EarlGrey,saurabhj80/EarlGrey,ed-chin/EarlGrey,sskhandp/EarlGrey,sskhandp/EarlGrey,ed-chin/EarlGrey,sskhandp/EarlGrey,google/EarlGrey,artyom-razinov/EarlGrey,artyom-razinov/EarlGrey,saurabhj80/EarlGrey,google/EarlGrey,ed-chin/EarlGrey,google/EarlGrey,saurabhj80/EarlGrey