feat: Add system log.

src/log/SystemOperationLog.h

@@ -0,0 +1,28 @@
+#ifndef SYSTEMOPERATIONLOG_H
+#define SYSTEMOPERATIONLOG_H
+
+#include <QDateTime>
+#include <QFile>
+#include <QTextStream>
+
+#define LOG_SYS_OPERATION(...)\
+SystemOperationLog::getInstance()->log(__VA_ARGS__);
+
+class SystemOperationLog
+{
+public:
+    static SystemOperationLog* getInstance();
+    void log(const QString& aOperationText);
+    void reloadFile();
+
+private:
+    SystemOperationLog();
+    ~SystemOperationLog();
+
+private:
+    QString mCurrentFileName;
+    QFile mLogFile;
+    QTextStream mStreamOut;
+};
+
+#endif // SYSTEMOPERATIONLOG_H