Add Kafka docs template to resources

dev/import-beats-resources/kafka/docs/README.md

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+# Kafka integration
+
+This integration collects logs and metrics from [https://kafka.apache.org](Kafka) servers.
+
+## Compatibility
+
+The `log` dataset is tested with logs from Kafka 0.9, 1.1.0 and 2.0.0.
+
+The `broker`, `consumergroup` and `partition` metricsets are tested with Kafka 0.10.2.1, 1.1.0, 2.1.1, and 2.2.2.
+
+The `broker` metricset requires Jolokia to fetch JMX metrics. Refer to the Metricbeat documentation about Jolokia for more information.
+
+## Logs
+
+### log
+
+The `log` dataset collects and parses logs from Kafka servers.
+
+The fields reported are:
+
+{{fields "log"}}
+
+## Metrics
+
+### broker
+
+<!-- TODO example event -->
+
+The fields reported are:
+
+{{fields "broker"}}
+
+### consumergroup
+
+<!-- TODO example event -->
+
+The fields reported are:
+
+{{fields "consumergroup"}}
+
+### partition
+
+<!-- TODO example event -->
+
+The fields reported are:
+
+{{fields "partition"}}