Add initial producer code

src/partition.cpp

@@ -0,0 +1,20 @@
+#include "partition.h"
+#include <librdkafka/rdkafka.h>
+
+namespace cppkafka {
+
+Partition::Partition() 
+: partition_(RD_KAFKA_PARTITION_UA) {
+
+}
+
+Partition::Partition(int partition) 
+: partition_(partition) {
+
+}
+
+int Partition::get_partition() const {
+    return partition_;
+}
+
+} // cppkafka