feat: update demo code

Cargo.toml

@@ -17,5 +17,6 @@ path = "scie-scanner"
 [workspace]
 members = [
  "scie-grammar",
- "scie-scanner"
+ "scie-scanner",
+ "benchmark"
 ]

benchmark/Cargo.toml

+[package]
+name = "benchmark"
+version = "0.1.0"
+authors = ["Phodal Huang <h@phodal.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+
+[dependencies.scie-grammar]
+path = "../scie-grammar"
+
+[dependencies.scie_scanner]
+path = "../scie-scanner"

benchmark/src/main.rs

+fn main() {
+    println!("Hello, world!");
+}