Doxygen fixes, improvements

src/blackcore/blackcore.h

@@ -1,9 +1,15 @@
 #ifndef BLACKCORE_H
 #define BLACKCORE_H
 
+//! \file
+
 /**
  * @namespace BlackCore
- * To be written
+ * Backend services of the swift project, like dealing with the network or the simulators.
  */
 
-#endif // BLACKCORE_H
+/**
+ * \defgroup dbus DBus related functions, classes, or definitions.
+ */
+
+#endif // guard