[doc] add tutorial for cluster utils (#3763)

* [doc] add en cluster utils doc

* [doc] add zh cluster utils doc

* [doc] add cluster utils doc in sidebar

docs/source/en/features/cluster_utils.md

@@ -0,0 +1,32 @@
+# Cluster Utilities
+
+Author: [Hongxin Liu](https://github.com/ver217)
+
+**Prerequisite:**
+- [Distributed Training](../concepts/distributed_training.md)
+
+## Introduction
+
+We provide a utility class `colossalai.cluster.DistCoordinator` to coordinate distributed training. It's useful to get various information about the cluster, such as the number of nodes, the number of processes per node, etc.
+
+## API Reference
+
+{{ autodoc:colossalai.cluster.DistCoordinator }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.is_master }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.is_node_master }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.is_last_process }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.print_on_master }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.print_on_node_master }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.priority_execution }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.destroy }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.block_all }}
+
+{{ autodoc:colossalai.cluster.DistCoordinator.on_master_only }}