Add initial producer code

include/cppkafka/producer.h

@@ -0,0 +1,30 @@
+#ifndef CPPKAFKA_PRODUCER_H
+#define CPPKAFKA_PRODUCER_H
+
+#include <memory>
+#include "kafka_handle_base.h"
+#include "configuration.h"
+
+namespace cppkafka {
+
+class Topic;
+class Buffer;
+class Partition;
+
+class Producer : public KafkaHandleBase {
+public:
+    Producer(Configuration config);
+
+    void produce(const Topic& topic, const Partition& partition, const Buffer& payload);
+    void produce(const Topic& topic, const Partition& partition, const Buffer& payload,
+                 const Buffer& key);
+    void produce(const Topic& topic, const Partition& partition, const Buffer& payload,
+                 const Buffer& key, void* user_data);
+private:
+    Configuration config_;
+    int message_payload_policy_;
+};
+
+} // cppkafka
+
+#endif // CPPKAFKA_PRODUCER_H