Better docs for the bank

src/lib.rs

@@ -1,3 +1,9 @@
+//! The `solana` library implements the Solana high-performance blockchain architecture.
+//! It includes a full Rust implementation of the architecture as well as hooks to GPU
+//! implementations of its most paralellizable components. It also includes command-line
+//! tools to spin up fullnodes and a Rust library `thin_client` to interact with them.
+//!
+
 #![cfg_attr(feature = "unstable", feature(test))]
 pub mod bank;
 pub mod banking_stage;