Introduce ICluster/Cluster in aws-msk

packages/@aws-cdk/aws-msk/README.md

@@ -9,6 +9,14 @@
 >
 > [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib
 
+![cdk-constructs: Experimental](https://img.shields.io/badge/cdk--constructs-experimental-important.svg?style=for-the-badge)
+
+> The APIs of higher level constructs in this module are experimental and under active development.
+> They are subject to non-backward compatible changes or removal in any future version. These are
+> not subject to the [Semantic Versioning](https://semver.org/) model and breaking changes will be
+> announced in the release notes. This means that while you may use them, you may need to update
+> your source code when upgrading to a newer version of this package.
+
 ---
 
 <!--END STABILITY BANNER-->

packages/@aws-cdk/aws-msk/lib/cluster.ts

@@ -0,0 +1,34 @@
+import { IResource, Resource } from '@aws-cdk/core';
+import { Construct } from 'constructs';
+
+/**
+ * Represents an MSK cluster
+ */
+export interface ICluster extends IResource {
+  /**
+   * the ARN of the MSK cluster
+   */
+  readonly clusterArn: string;
+}
+
+/**
+ * An MSK cluster
+ */
+export class Cluster {
+  /**
+   * Creates a Cluster construct that represents an existing MSK cluster.
+   * @param scope
+   * @param id
+   * @param clusterArn
+   */
+  public static fromClusterArn(scope: Construct, id: string, clusterArn: string): ICluster {
+    class Imported extends Resource implements ICluster {
+      public readonly clusterArn: string;
+      constructor() {
+        super(scope, id);
+        this.clusterArn = clusterArn;
+      }
+    }
+    return new Imported();
+  }
+}

packages/@aws-cdk/aws-msk/lib/index.ts

@@ -1,2 +1,3 @@
+export * from './cluster';
 // AWS::MSK CloudFormation Resources:
 export * from './msk.generated';

packages/@aws-cdk/aws-msk/package.json

@@ -90,7 +90,7 @@
     "node": ">= 10.13.0 <13 || >=13.7.0"
   },
   "stability": "experimental",
-  "maturity": "cfn-only",
+  "maturity": "experimental",
   "awscdkio": {
     "announce": false
   }