Add guidence to how to set cfg in readme and skills

[Can-Zhao]

Current code assume cfg scale to be 0. This is only valid for CT. MR images require cfg to be >0, like 10.
Need to add this knowledge in readme and inference skills

[Sidharth1743]

@Can-Zhao Can i do this instead ?

[Can-Zhao]

I'm working on it. May I ask if you could help review it after it is drafted?

[Sidharth1743]

yes sure ping me if it is completed