Implement prepareNeuralNetworkFile

Startcode/neuralNetwork.h

@@ -20,6 +20,7 @@ typedef struct
 } NeuralNetwork;
 
 NeuralNetwork loadModel(const char *path);
+void saveModel(const char *path, const NeuralNetwork nn);
 unsigned char *predict(const NeuralNetwork model, const GrayScaleImage images[], unsigned int numberOfImages);
 void clearModel(NeuralNetwork *model);