New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/storage/diff_scheme/apply_diff.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include "mwm_diff/diff.hpp"
+
+#include "storage/storage_defines.hpp"
+
+#include <functional>
+
+namespace base
+{
+class Cancellable;
+}
+
+namespace storage
+{
+namespace diffs
+{
+struct ApplyDiffParams
+{
+  std::string m_diffReadyPath;
+  LocalFilePtr m_diffFile;
+  LocalFilePtr m_oldMwmFile;
+};
+
+using OnDiffApplicationFinished = std::function<void(generator::mwm_diff::DiffApplicationResult)>;
+
+void ApplyDiff(ApplyDiffParams && p, base::Cancellable const & cancellable,
+               OnDiffApplicationFinished const & task);
+}  // namespace diffs
+}  // namespace storage