add napi mock for settingsdata

link https://gitee.com/openharmony/applications_settings/issues/I4MBU6

Signed-off-by: yangpeng85 <yangpeng85@huawei.com>

api/@ohos.settings.d.ts

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2021 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { DataAbilityHelper } from './ability/dataAbilityHelper';
+
+/**
+ * This module provides settings data access abilities.
+ *
+ * @since 8
+ * @devices phone, tablet, tv, wearable, car
+ * @import import settings from '@ohos.settings'
+ * @permission N/A
+ */
+declare namespace settings {
+
+    /**
+     * get settingsdata uri
+     * @since 8
+     * @param name uri parameter
+     * @return settingsdata uri
+     */
+    function getUri(name: string): string;
+
+    /**
+     * get value from settingsdata
+     * @since 8
+     * @param dataAbilityHelper dataAbilityHelper instance
+     * @param name name
+     * @param defValue default value
+     * @return settingsdata value
+     */
+     function getValue(dataAbilityHelper: DataAbilityHelper, name: string, defValue: string): string;
+
+    /**
+     * set settingsdata value
+     * @need permission ohos.permission.WRITE_SYSTEM_SETTING
+     * @since 8
+     * @param dataAbilityHelper dataAbilityHelper instance
+     * @param name name
+     * @param value value
+     * @return value set result
+     */
+     function setValue(dataAbilityHelper: DataAbilityHelper, name: string, value: string): boolean;
+
+}
+
+export default settings;