Added SimpleProducer sample

Author: DavidTompkins

samples/README.md

@@ -13,7 +13,7 @@ I tried to make each sample a standalone compile, e.g.:
 
 The sample code and the compile command above assume you have installed libkafka via the RPM, with the includes in /usr/include/libkafka and the shared library in /usr/lib. Also note the runtime library dependencies on zlib, snappy, and the libkafka library.
 
-You will need to set hostname and topic_name variables to something that makes sense for your kafka deployment. For samples that produce messages to clustered topics, the hostname variable should be the hostname of the broker that is specified as the leader for the specified topic.
+You will need to set `hostname` and `topic_name` to something that makes sense for your kafka deployment. For samples that produce messages to clustered topics, `hostname` should be the hostname of the broker that is specified as the leader for the specified topic.
 
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