kafkacat: add page (#2430)

pages/common/kafkacat.md

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+# kafkacat
+
+> Apache Kafka producer and consumer tool.
+
+- Consume messages starting with the newest offset:
+
+`kafkacat -C -t {{topic}} -b {{brokers}}`
+
+- Consume messages starting with the oldest offset and exit after the last message is received:
+
+`kafkacat -C -t {{topic}} -b {{brokers}} -o beginning -e`
+
+- Consume messages as a Kafka consumer group:
+
+`kafkacat -G {{group_id}} {{topic}} -b {{brokers}}`
+
+- Publish message by reading from stdin:
+
+` echo {{message}} | kafkacat -P -t {{topic}} -b {{brokers}}`
+
+- Publish messages by reading from a file:
+
+`kafkacat -P -t {{topic}} -b {{brokers}} {{path/to/file}}`
+
+- List metadata for all topics and brokers:
+
+`kafkacat -L -b {{brokers}}`
+
+- List metadata for a specific topic:
+
+`kafkacat -L -t {{topic}} -b {{brokers}}`
+
+- Get offset for a topic/partition for a specific point in time:
+
+`kafkacat -Q -t {{topic}:{{partition}}:{{unix_timestamp}} -b {{brokers}}`