Add a first example of how to use the new Dlib layers to build a Transformer-type network.

Author: Cydral

examples/CMakeLists.txt

@@ -146,6 +146,7 @@ add_example(dnn_metric_learning_on_images_ex)
 add_gui_example(dnn_dcgan_train_ex)
 add_gui_example(dnn_yolo_train_ex)
 add_gui_example(dnn_self_supervised_learning_ex)
+add_example(slm_basic_train_ex)
 add_gui_example(3d_point_cloud_ex)
 add_example(bayes_net_ex)
 add_example(bayes_net_from_disk_ex)