rust: add license and description (#79)

Author: tjdevries

Readme.md

@@ -48,7 +48,7 @@ binary locally you can do so with:
 ```sh
 git clone https://github.com/sourcegraph/scip.git --depth=1
 cd scip
-go build -o scip ./cmd 
+go build -o scip ./cmd
 ```
 
 ## SCIP CLI reference

bindings/rust/Cargo.toml

@@ -2,6 +2,10 @@
 name = "scip"
 version = "0.1.0"
 edition = "2021"
+license = "Apache-2.0"
+description = """
+SCIP (pronunciation: "skip") is a language-agnostic protocol for indexing source code, which can be used to power code navigation functionality such as Go to definition, Find references, and Find implementations.
+"""
 
 # We need >= 1.60.0 because the generated code uses
 # https://doc.rust-lang.org/std/vec/struct.Vec.html#method.spare_capacity_mut