Add project files

source/BreezeCore/include/breeze/Error.hpp

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+#pragma once
+
+#include <stdexcept>
+#include <string>
+
+namespace breeze
+{
+
+	/// Every failure the CLI reports to the user: a message and the process exit code to end with.
+	class Error : public std::runtime_error
+	{
+	public:
+		explicit Error(const std::string& message, int exitCode = 1)
+			: std::runtime_error(message), m_exitCode(exitCode)
+		{
+		}
+
+		[[nodiscard]] int exitCode() const noexcept { return m_exitCode; }
+
+	private:
+		int m_exitCode;
+	};
+
+}