Add some docs

src/main/java/services/ImageService.java

@@ -12,6 +12,9 @@ import infrastructure.image.io.ImageSaver;
 import java.io.File;
 import java.io.IOException;
 
+/**
+ * @author Laurent Crema
+ */
 public class ImageService {
 
     private final AppState appState;

src/main/java/services/ModeService.java

@@ -4,6 +4,9 @@ import app.state.AppState;
 import com.google.inject.Inject;
 import domain.common.Mode;
 
+/**
+ * @author Laurent Crema
+ */
 public class ModeService {
 
     private final AppState appState;