Implement creating a new directory.

VirtualFileSystem/test.cpp

@@ -38,9 +38,13 @@ int main(int c, char** v)
         return 1;
     }
 
-#if 1
+#if 0
     auto newFile = vfs.create("/empty");
     printf("vfs.create: %p\n", newFile.ptr());
+#endif
+#if 1
+    auto newDir = vfs.mkdir("/mydir");
+    printf("vfs.mkdir: %p\n", newDir.ptr());
 #endif
     //return 0;