Merge pull request #3687 from aws/version_maintenance

version maintenance policy added to ReadMe.

README.md

@@ -483,6 +483,13 @@ Keeping the list of open issues lean will help us respond in a timely manner.
 
 We work hard to provide a high-quality and useful SDK for our AWS services, and we greatly value feedback and contributions from our community. Please review our [contributing guidelines](./CONTRIBUTING.md) before submitting any [issues] or [pull requests][pr] to ensure we have all the necessary information to effectively respond to your bug report or contribution.
 
+## Maintenance and support for SDK major versions
+
+For information about maintenance and support for SDK major versions and our underlying dependencies, see the following in the AWS SDKs and Tools Shared Configuration and Credentials Reference Guide:
+
+* [AWS SDKs and Tools Maintenance Policy](https://docs.aws.amazon.com/credref/latest/refdocs/maint-policy.html)
+* [AWS SDKs and Tools Version Support Matrix](https://docs.aws.amazon.com/credref/latest/refdocs/version-support-matrix.html)
+
 ## Resources
 
 [Developer guide](https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/welcome.html) - This document