How to add shaders to my game, ex: Toon Shading

I would like to know how to add a shader specific to my game, and also how to create one.

Thx in advance

How to make: http://unity3d.com/support/documentation/Manual/ShaderTut1.html

You can find a node based editor here: http://forum.unity3d.com/threads/34570-ShaderFusion-node-based-shader-editor-(Closed-Beta)

To add, you have the Toon Shader pack. So, grab one of the shader objects, eg: Toony - Basic. Drag that on to an Inspector view of a gameobject, and it'll add it. From here you can edit it.

Good luck and any questions ask in comment!