Small animation help

I have a sphere I want to animate, for the Murder gamemode (the “clue” items).

All I want it to do is spin. that’s all.

Any idea what’s the easiest/simplest way to do this, in any program? I have Blender right now, but i have no idea how to use it properly.
I tried to, but then it went into bones and got complicated fast.

Can anyone help me?