Initial oss-fuzz integration. (#529)

Signed-off-by: davkor <david@adalogics.com>

src/lib.rs

@@ -117,6 +117,10 @@ pub mod client;
 pub mod server;
 mod share;
 
+#[cfg(fuzzing)]
+#[cfg_attr(feature = "unstable", allow(missing_docs))]
+pub mod fuzz_bridge;
+
 pub use crate::error::{Error, Reason};
 pub use crate::share::{FlowControl, Ping, PingPong, Pong, RecvStream, SendStream, StreamId};