New cpp folder structure

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

libs/descriptions/header.hpp

@@ -0,0 +1,43 @@
+#pragma once
+
+#include "coding/reader.hpp"
+#include "coding/serdes_binary_header.hpp"
+#include "coding/write_to_sink.hpp"
+
+#include <cstdint>
+
+namespace descriptions
+{
+struct HeaderV0
+{
+  template <typename Visitor>
+  void Visit(Visitor & visitor)
+  {
+    visitor(m_featuresOffset, "featuresOffset");
+    visitor(m_langMetaOffset, "langMetaOffset");
+    visitor(m_indexOffset, "indexOffset");
+    visitor(m_stringsOffset, "stringsOffset");
+    visitor(m_eosOffset, "eosOffset");
+  }
+
+  template <typename Sink>
+  void Serialize(Sink & sink)
+  {
+    coding::binary::HeaderSerVisitor<Sink> visitor(sink);
+    visitor(*this);
+  }
+
+  template <typename Source>
+  void Deserialize(Source & source)
+  {
+    coding::binary::HeaderDesVisitor<Source> visitor(source);
+    visitor(*this);
+  }
+
+  uint64_t m_featuresOffset = 0;
+  uint64_t m_langMetaOffset = 0;
+  uint64_t m_indexOffset = 0;
+  uint64_t m_stringsOffset = 0;
+  uint64_t m_eosOffset = 0;  // End of section.
+};
+}  // namespace descriptions