Port web_service from Citra

src/web_service/verify_login.h

@@ -0,0 +1,22 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <functional>
+#include <future>
+#include <string>
+
+namespace WebService {
+
+/**
+ * Checks if username and token is valid
+ * @param host the web API URL
+ * @param username yuzu username to use for authentication.
+ * @param token yuzu token to use for authentication.
+ * @returns a bool indicating whether the verification succeeded
+ */
+bool VerifyLogin(const std::string& host, const std::string& username, const std::string& token);
+
+} // namespace WebService