that's probalby a stupid question but i wanted to make sure if its possible to add animated sprites to a game in easy fps editor

Make a decoration, create a FSM for it - voila.

There is a simple cheesy way around it - make your decoration into an enemy with a speed and damage of 0. As soon as you're in view, it will try to move to you and display 4 frames of walking animation. It will be destructible and have death animation. If you don't want it to be destroyed, just give it some obscene amount of health (like 99999). The only issue is that when you'll be in melee range, it will show only 2 frames of attack animation.