add readme for the embedded consumer system test

system_test/embedded_consumer/README

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+This test replicates messages from one kafka node to another using the embedded consumer. At the end, the messages 
+produced at the source kafka node should be identical to that at the target kafka node.
+
+To run this test, do
+bin/run-test.sh
+
+The expected output is given in expected.out. There are 2 things to pay attention to:
+1. The output should have a line "test passed".
+2. The throughput from the producer should be around 90,000 Messages/sec on a typical machine.
+
+This test may take 10 to 15 minutes to finish.

system_test/embedded_consumer/expected.out

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+start the servers ...
+start producing messages ...
+Total Num Messages: 10000000 bytes: 1994374785 in 106.076 secs
+Messages/sec: 94272.0314
+MB/sec: 17.9304
+[2011-05-02 11:50:29,022] INFO Disconnecting from localhost:9092 (kafka.producer.SyncProducer)
+wait for consumer to finish consuming ...
+test passed
+bin/../../../bin/kafka-server-start.sh: line 11:   359 Terminated              $(dirname $0)/kafka-run-class.sh kafka.Kafka $@
+bin/../../../bin/zookeeper-server-start.sh: line 9:   357 Terminated              $(dirname $0)/kafka-run-class.sh org.apache.zookeeper.server.quorum.QuorumPeerMain $@
+bin/../../../bin/zookeeper-server-start.sh: line 9:   358 Terminated              $(dirname $0)/kafka-run-class.sh org.apache.zookeeper.server.quorum.QuorumPeerMain $@