docs: add link to csln-rs repo

Signed-off-by: Bruce D'Arcus <bdarcus@gmail.com>

README.md

@@ -99,17 +99,7 @@ $ quicktype schemas/csl-style-schema.json -o style.rs
 Note that the generated code will include a model definition, that should mostly
 match the typescript model, _and_ serialization and deserialization code.
 
-Here’s some minimal rust code to deserialize and serialize the JSON example
-style file to Rust Style struct, with result `APA`:
-
-```rust
-fn main() {
-   let json = fs::read_to_string("src/style.csl.json")
-       .expect("Unable to read file");
-   let style: Style = serde_json::from_str(&json).unwrap();
-   println!("{}", serde_json::to_string(&style.title).unwrap());
-}
-```
+[Here's a small demo repository](https://github.com/bdarcus/csln-rs) that includes a script to run this conversion, and then builds a simple rust binary that can read and write a `Style` or `InputReference`.
 
 Feel free to experiment with your language of choice and report your experience!