add gen from riscv config software

[AbdessamiiOukalrazqou]

This software takes a`Risc -V Config Yaml description of CSR Registers, and generates ReStructuredText documents and Mardown Documents for CSR Registers and ISA Extensions. In the example/tb directory there is an example of how to generate the packages

[JeanRochCoulon]

@AbdessamiiOukalrazqou Can you sign the Eclipse agreement, needed to contribute to the CVA6 repository.

[github-actions[bot]]

:heavy_check_mark: successful run, report available here.