docs: Add Version Support SLA (#123)

This PR adds a version support SLA to the README

[category:Documentation]

README.md

@@ -6,6 +6,12 @@ _Canvas design token infrastructure_
 
 This repository builds design tokens for various platforms and formats.
 
+## Version Support
+
+At this time, we only support the latest major version of our Canvas Tokens Web package. This means we will not provide patches or new features to previous major versions. If you need assistance with a previous version, please reach out to the team. We're happy to help.
+
+If you find an issue and would like support, please follow [our guidelines](https://github.com/Workday/canvas-tokens/blob/main/CONTRIBUTING.md#creating-an-issue) to create an issue in our Contributing Guidelines doc.
+
 ## Contributing
 
 Contributions are welcome! Please read our [Contributing Guidelines doc](CONTRIBUTING.md) to learn