Add initial CCS mod: (#6)

- port initial CCS structure with methods from multifolding-poc
- add R1CS helper methods, which will be used in Nova impl

src/lib.rs

@@ -8,6 +8,7 @@ use thiserror::Error;
 
 pub mod transcript;
 use transcript::Transcript;
+pub mod ccs;
 pub mod pedersen;
 pub mod utils;