Manager: Add verbose flag and store it in new Config class

Check the verbosity in the Dotfile class when printing file operations.

src/config.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include "util/singleton.h"
+
+class Config : public Util::Singleton<Config> {
+public:
+	Config(s) {}
+	virtual ~Config() {}
+
+	void setVerbose(bool verbose) { m_verbose = verbose; }
+
+	bool verbose() const { return m_verbose; }
+
+private:
+	bool m_verbose { false };
+};
+
+#endif // CONFIG_H