Warn that Noname is only partially-supported

I stumbled across https://github.com/dmpierre/ark-noname/blob/d85ebf493b89c403d8c9f8e5e72d9bcfc0e3d51e/src/utils.rs#L10

There are 2 things that I think need to be done.

1. Consider porting this crate into this workspace for much easier manteinance. Specially with patched dependencies matching and easier modifications and updates when needed.
2. We need to write in the README a warning about the impossibility of using noname libraries atm.

cc: @dmpierre

Start with the referenced src/utils.rs in the external ark-noname repository and inspect this workspace's dependency and crate layout. Then locate the README and determine the scope of documenting Noname's partial support and considering a workspace port. Done means the README warning is present and the porting work is either completed or explicitly scoped.

Written by the indexing model from the issue text.