Add build script to build using Cargo.

Cargo.lock

@@ -2,6 +2,24 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "cc"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd9de9f2205d5ef3fd67e685b0df337994ddd4495e2a28d185500d0e1edfea47"
+dependencies = [
+ "shlex",
+]
+
 [[package]]
 name = "first-rust"
 version = "0.1.0"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"

Cargo.toml

@@ -4,3 +4,6 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+
+[build-dependencies]
+cc = '1.2.1'

build.rs

@@ -0,0 +1,7 @@
+fn main() {
+    // Tell Cargo to rerun if the c file is changed
+    println!("cargo:rerun-if-changed=src/test.c");
+    cc::Build::new()
+        .file("src/test.c")
+        .compile("test");
+}