add front demo in this project

LFtid1056/cloudfront/code/rocketmq/Arg_helper.h

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#ifndef _ARG_HELPER_H_
+#define _ARG_HELPER_H_
+
+#include <string>
+#include <vector>
+#include "RocketMQClient.h"
+
+namespace rocketmq {
+class ROCKETMQCLIENT_API Arg_helper {
+ public:
+  Arg_helper(int argc, char* argv[]);
+  Arg_helper(std::string arg_str_);
+  std::string get_option(int idx_) const;
+  bool is_enable_option(std::string opt_) const;
+  std::string get_option_value(std::string opt_) const;
+
+ private:
+  std::vector<std::string> m_args;
+};
+
+}  // namespace rocketmq
+
+#endif  //<!_ARG_HELPER_H_;