How to play an animation when the npc touches player?

Hello guys, I have a zombie. you know zombies hits with their hands so, i gave them a sword they still hit with their hands but i just want to add a swing animation to zombie so i think when i add an animation to sword it wont play. How can i make the attack animation for it.

For example:

When zombie hit, animation plays.

I think it's pretty simple but i don't know how to make it please help me.

if you did not make the animation then follow these steps

1. go to the plugins tab
2. make a rig by clicking rig builder if you havent
3. when you have your rig click animation editor
4. click the rig that you made
5. make animation

put this in your script

local zombie = script.Parent
local zombieSwing = Instance.new("Animation", zombie)
zombieSwing.AnimationId = "rbxasset://00000000 --put your animation id here (replace the zeros)
local zombieHum = zombie:FindFirstChild("Humanoid")

local zombieSwingTrack = zombieHum.LoadAnimation(zombieSwing)

and then put this where you want to play the animation

zombieSwingTrack:Play()