Add example for cuda_binary and cuda_test macros

examples/basic_macros/BUILD.bazel

@@ -0,0 +1,13 @@
+load("@rules_cuda//cuda:defs.bzl", "cuda_binary", "cuda_test")
+
+package(default_visibility = ["//visibility:public"])
+
+cuda_binary(
+    name = "main",
+    srcs = ["main.cu"],
+)
+
+cuda_test(
+    name = "test",
+    srcs = ["main.cu"],
+)

examples/basic_macros/main.cu

@@ -0,0 +1,26 @@
+#include <cstdio>
+
+#define CUDA_CHECK(expr)                                                \
+  do {                                                                  \
+    cudaError_t err = (expr);                                           \
+    if (err != cudaSuccess) {                                           \
+      fprintf(stderr, "CUDA Error Code  : %d\n     Error String: %s\n", \
+              err, cudaGetErrorString(err));                            \
+      exit(err);                                                        \
+    }                                                                   \
+  } while (0)
+
+__global__ void kernel() {
+  printf("cuda kernel called!\n");
+}
+
+void launch() {
+  kernel<<<1, 1>>>();
+  CUDA_CHECK(cudaGetLastError());
+  CUDA_CHECK(cudaDeviceSynchronize());
+}
+
+int main() {
+  launch();
+  return 0;
+}