Add readme entry.

Author: Oleksandr Kostenko

exporter/clickhouseexporter/README.md

@@ -13,7 +13,7 @@
 <!-- end autogenerated section -->
 
 
-This exporter supports sending OpenTelemetry data to [ClickHouse](https://clickhouse.com/). 
+This exporter supports sending OpenTelemetry data to [ClickHouse](https://clickhouse.com/).
 > ClickHouse is an open-source, high performance columnar OLAP database management system for real-time analytics using
 > SQL.
 > Throughput can be measured in rows per second or megabytes per second.
@@ -302,6 +302,18 @@ Processing:
     - `max_elapsed_time` (default = 300s): The maximum amount of time spent trying to send a batch; ignored if `enabled`
       is `false`
 
+Cluster definition:
+
+- `cluster_name` (default = ): The cluster name allows to create database or table on cluster. When set '`ON CLUSTER cluster_name`' string is present in creation query.
+
+Table engine:
+
+- `table_engine`
+    - `name` (default = MergeTree)
+    - `params` (default = )
+
+Modifies `ENGINE` definition when table is created. If not set then `ENGINE` defaults to `MergeTree` Combined with `cluster_name` allows to implement [replication for fault tolerance scenario](https://clickhouse.com/docs/en/architecture/replication).
+
 ## TLS
 
 The exporter supports TLS. To enable TLS, you need to specify the `secure=true` query parameter in the `endpoint` URL or
@@ -334,6 +346,10 @@ exporters:
       initial_interval: 5s
       max_interval: 30s
       max_elapsed_time: 300s
+    # Uncomment if there is a need for replication accross cluster instances
+    # table_engine:
+    #   name: ReplicatedMergeTree
+    # cluster_name: my_cluster
 service:
   pipelines:
     logs: