Добавлены структуры исключений

src/exceptions/exception422_unprocessable_entity.cpp

@@ -0,0 +1,18 @@
+#include "exception422_unprocessable_entity.h"
+
+#include <boost/beast/core/error.hpp>
+
+using namespace std;
+using namespace std::literals;
+
+namespace uad
+{
+exception422_unprocessable_entity::exception422_unprocessable_entity(const string& info): message_(info)
+{
+}
+
+char const* exception422_unprocessable_entity::what() const
+{
+  return message_.c_str();
+}
+}

src/exceptions/exception422_unprocessable_entity.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <exception>
+#include <string>
+
+namespace uad
+{
+struct exception422_unprocessable_entity : std::exception
+{
+private:
+  std::string message_;
+public:
+  exception422_unprocessable_entity(const std::string& info);
+  char const* what() const override;
+};
+}