added profile and version adding through comboBox

launcherbackend.h

@@ -0,0 +1,44 @@
+#pragma once
+
+#include <QObject>
+#include <QStringList>
+#include <QQmlEngine>
+
+class LauncherBackend : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(QStringList profileNames READ profileNames NOTIFY profilesChanged)
+    Q_PROPERTY(QStringList versionNames READ versionNames NOTIFY versionsChanged)
+
+public:
+    explicit LauncherBackend(QObject *parent = nullptr);
+
+    QStringList profileNames() const;
+    QStringList versionNames() const;
+
+    Q_INVOKABLE void addProfile(const QString &name, const QString &login, const QString &password);
+    Q_INVOKABLE void addVersion(const QString &name, const QString &serverUrl);
+    Q_INVOKABLE void launchGame(int profileIndex, int versionIndex);
+
+signals:
+    void profilesChanged();
+    void versionsChanged();
+    void launched(const QString &profileName, const QString &versionName, const QString &serverUrl);
+    void launchError(const QString &message);
+
+private:
+    struct Profile { int id; QString name, login, password; };
+    struct Version { int id; QString name, serverUrl; };
+
+    void loadData();
+    void saveProfiles();
+    void saveVersions();
+
+    QList<Profile> m_profiles;
+    QList<Version> m_versions;
+    QString m_dataDir;
+    int m_nextProfileId = 1;
+    int m_nextVersionId = 1;
+};