feat: added buildfile

Author: madhav-madhusoodanan

samples/introduction/matmul/build.rs

@@ -0,0 +1,17 @@
+use std::env;
+use std::path;
+
+use cuda_builder::CudaBuilder;
+
+fn main() {
+    println!("cargo::rerun-if-changed=build.rs");
+    println!("cargo::rerun-if-changed=kernels");
+
+    let out_path = path::PathBuf::from(env::var("OUT_DIR").unwrap());
+    let manifest_dir = path::PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+
+    CudaBuilder::new(manifest_dir.join("kernels"))
+        .copy_to(out_path.join("kernels.ptx"))
+        .build()
+        .unwrap();
+}