add: spdlog and basic client code.

ClientCore/ClientCore.h

@@ -0,0 +1,35 @@
+#ifndef CLIENTCORE_H
+#define CLIENTCORE_H
+
+#include <Protocol.h>
+#include <QDataStream>
+#include <QHostAddress>
+#include <QMutex>
+#include <QMutexLocker>
+#include <QTcpSocket>
+#include <QThread>
+
+class ClientCore : public QObject
+{
+    Q_OBJECT
+
+public:
+    ClientCore(QObject* parent = nullptr);
+    ~ClientCore();
+
+public:
+    bool Connect(const QString& ip, quint16 port);
+    void Disconnect();
+
+public:
+    QTcpSocket* socket_;
+    QMutex conMutex_;
+    // QSharedPointer<ClientUserInterface> cf;
+
+    std::function<void(const QString& path)> pathCall_;
+
+    QString remoteID_;
+    QByteArray recvBuffer_;
+};
+
+#endif   // CLIENTCORE_H