Добавлены структуры исключений

src/exceptions/exception400_bad_request.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <exception>
+#include <string>
+
+namespace uad
+{
+struct exception400_bad_request : std::exception
+{
+private:
+  std::string message_;
+public:
+  exception400_bad_request(const std::string& info);
+  char const* what() const override;
+};
+}