New cpp folder structure

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

libs/platform/string_storage_base.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <map>
+#include <mutex>
+#include <string>
+
+namespace platform
+{
+class StringStorageBase
+{
+public:
+  explicit StringStorageBase(std::string const & path);
+  void Save() const;
+  void Clear();
+  bool GetValue(std::string_view key, std::string & outValue) const;
+  void SetValue(std::string_view key, std::string && value);
+  void Update(std::map<std::string, std::string> const & values);
+  void DeleteKeyAndValue(std::string_view key);
+
+private:
+  using Container = std::map<std::string, std::string, std::less<>>;
+  Container m_values;
+  mutable std::mutex m_mutex;
+  std::string const m_path;
+};
+}  // namespace platform