added JSON support to select the services

src/json_settings.h

@@ -0,0 +1,22 @@
+#ifndef JSON_SETTINGS_H
+#define JSON_SETTINGS_H
+
+#include <vector>
+#include <string>
+#include <expected>
+#include <optional>
+
+struct Service {
+    std::string name;
+    std::string service;
+};
+
+struct AppSettings {
+    static std::expected<AppSettings, std::string> loadAppSettings();
+
+    std::optional<const std::string&> getId(std::string_view name);
+
+    std::vector<Service> services;
+};
+
+#endif // JSON_SETTINGS_H