How to make the FPS camera lean left and right?

Hello! I’m almost done with my first person horror game controls. I can crouch, sprint with a limit and I have a head bobbing effect for some realism. I was wondering how I could make the FPS camera lean a little as if you where peaking around a corner ever so slightly. I don’t think this will affect whether or not a monster will notice you but for now its kind of a gimmick. I want it to lean using the Q and E controls (Q left/E right). Any ideas would be helpful!

Check my answer here : Character controls seen in Amnesia - Questions & Answers - Unity Discussions