Add metadata for crates.io

Author: SimonSapin

Cargo.toml

@@ -2,7 +2,9 @@
 name = "rustc-test"
 version = "0.1.0"
 authors = ["The Rust Project Developers"]
-license = "MIT OR Apache-2.0"
+license = "MIT OR Apache-2.0"
+description = "A fork of Rust’s `test` crate that doesn’t require unstable language features."
+repository = "https://github.com/SimonSapin/rustc-test"
 
 [lib]
 name = "test"