add empty bench

benches/bench.rs

@@ -1 +1,8 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
 
+pub fn criterion_benchmark(c: &mut Criterion) {
+    c.bench_function("ecc", |b| b.iter(|| true));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);