background picture in my game

Hi...

I have a simple 2d game in my scene with orthographic camera. What i want is to put a picture i did in photoshop as background. What i have to create ? Thank you.

Import the image as a texture, and then create a material that uses that texture. Then create a 'plane' primitive object, remove the collider component (assuming you don't need it), and assign the material to the plane.

Technically, the built-in plane may be more highly tessellated than is actually needed for this, but it's most likely the easiest and quickest solution. (An alternative would be to make your own 'quad' mesh in a modeling program.)