Added a function for checking whether CUDA-capable devices are available

include/astaroth.h

@@ -49,6 +49,10 @@ AcResult acInit(const AcMeshInfo mesh_info);
  * called at exit. */
 AcResult acQuit(void);
 
+/** Checks whether there are any CUDA devices available. Returns AC_SUCCESS if there is 1 or more,
+ * AC_FAILURE otherwise. */
+AcResult acCheckDeviceAvailability(void);
+
 /** Synchronizes a specific stream. All streams are synchronized if STREAM_ALL is passed as a
  * parameter*/
 AcResult acSynchronizeStream(const Stream stream);