This is really easy. Paste this code inside of SERVERSCRIPTSERVICE. Enjoy!
local plrs = game.Players
plrs.PlayerAdded:Connect(function(plr)
local stats = Instance.new("Folder")
stats.Name = "leaderstats"
stats.Parent = plr
local wipeouts = Instance.new("IntValue")
wipeouts.Name = "Wipeouts"
wipeouts.Value = 0
wipeouts.Parent = stats
plr.CharacterAdded:Connect(function(char)
local humanoid = char:FindFirstChild("Humanoid")
humanoid.Died:Connect(function()
wipeouts.Value = wipeouts.Value + 1
end)
end)
end)