chore: advertise construct hub on the readme (#20844)

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### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

README.md

@@ -9,6 +9,8 @@
 [![Go Reference](https://pkg.go.dev/badge/github.com/aws/aws-cdk-go/awscdk.svg)](https://pkg.go.dev/github.com/aws/aws-cdk-go/awscdk)
 [![Mergify](https://img.shields.io/endpoint.svg?url=https://gh.mergify.io/badges/aws/aws-cdk&style=flat)](https://mergify.io)
 
+[![View on Construct Hub](https://constructs.dev/badge?package=aws-cdk-lib)](https://constructs.dev/packages/aws-cdk-lib)
+
 The **AWS Cloud Development Kit (AWS CDK)** is an open-source software development
 framework to define cloud infrastructure in code and provision it through AWS CloudFormation.