Hello World should print all its arguments

usr/hello/hello.c

@@ -21,5 +21,11 @@
 int main(int argc, char *argv[])
 {
     printf("Hello, world! from userspace\n");
+    
+    printf("argv:\n");
+    for(int i = 0; i < argc; ++i) {
+        printf("  %d -> %s\n", i, argv[i]);
+    }
+
     return EXIT_SUCCESS;
 }