feat: added os signal handler (#2029)

client/core/osSignalHandler.h

@@ -0,0 +1,17 @@
+#ifndef OSSIGNALHANDLER_H
+#define OSSIGNALHANDLER_H
+
+#include <QObject>
+
+class OsSignalHandler : public QObject
+{
+    Q_OBJECT
+public:
+    static void setup();
+
+private:
+    explicit OsSignalHandler(QObject *parent = nullptr);
+    static void handleSignal(int signal);
+};
+
+#endif // OSSIGNALHANDLER_H