Hello World gRPC call

rust-lightclient/build.rs

@@ -0,0 +1,12 @@
+fn main() {
+    // Build proto files
+    tower_grpc_build::Config::new()
+        .enable_server(false)
+        .enable_client(true)
+        .build(
+            &["proto/service.proto", "proto/compact_formats.proto"],
+            &["proto"],
+        )
+        .unwrap_or_else(|e| panic!("protobuf compilation failed: {}", e));
+    println!("cargo:rerun-if-changed=proto/service.proto");
+}