Hardcover Progress Plugin

plugins/hardcover/HardcoverPlugin.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <Arduino.h>
+
+namespace HardcoverPlugin {
+
+    enum class SyncResult {
+        OK,           // All books synced successfully
+        NO_BOOKS,     // No in-progress epub books with ISBN found
+        NO_TOKEN,     // API token not configured
+        NO_WIFI,      // Not connected to WiFi
+        API_ERROR,    // HTTP or GraphQL error from Hardcover
+    };
+
+    SyncResult syncProgress();
+}