add more noise types

[johnnychen94]

Before reexport this package in Images.jl, I need to fulfill this package with more features.

List of noises that I know:

• Rician noise
• multiplicative gaussian noise
• Poisson noise
• salt & pepper noise

Except for the Rician noise, others are already implemented in Noise.jl, maybe I should just steal it from Noise.jl, or join forces it so that we get a mini package that focus on noise generation. This package is expected to also include many noise reduction algorithms so it will be bigger than Noise.jl.

cc: @roflmaostc

Edit:

• Cauchy noise
• gamma noise
• exponential noise
• uniform noise

[roflmaostc]

Yeah I definitely think we should join forces.

Noise.jl only works on RGB, Gray and plain arrays and is not very well written (first Julia project ...).

Once I tried to add Poisson here and it took quite a while to understand what you're doing.

Right now I'm somehow busy with other projects and probably can't contribute much.