Moved tests

tests/hello_world.cu

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <cuda_runtime.h>
+
+__global__ void hello_from_gpu() {
+    printf("Hello from GPU!\n");
+}
+
+int main() {
+    hello_from_gpu<<<1, 1>>>();
+
+    cudaDeviceSynchronize();
+
+    // Reset device
+    cudaDeviceReset();
+    return 0;
+}