Adding a working bft-json-crdt implementation for the PoC

crates/bft-json-crdt/src/lib.rs

@@ -0,0 +1,8 @@
+pub mod debug;
+pub mod json_crdt;
+pub mod keypair;
+pub mod list_crdt;
+pub mod lww_crdt;
+pub mod op;
+
+extern crate self as bft_json_crdt;