Add abstract class for datastore access

Change-Id: Ib34ebd24ae639ddd3640e7f6636b236d3232236e
diff --git a/src/datastore_access.cpp b/src/datastore_access.cpp
new file mode 100644
index 0000000..2b7243b
--- /dev/null
+++ b/src/datastore_access.cpp
@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2018 CESNET, https://photonics.cesnet.cz/
+ * Copyright (C) 2018 FIT CVUT, https://fit.cvut.cz/
+ *
+ * Written by Václav Kubernát <kubervac@fit.cvut.cz>
+ *
+*/
+
+#include "datastore_access.hpp"
+
+DatastoreAccess::~DatastoreAccess() = default;