Update README.md

Author: danny-gallagher

README.md

@@ -15,6 +15,7 @@
 - [Overview](#overview)
   - [Compatibility](#compatibility)
   - [References](#references)
+  - [Versioning and Deprecation Policy](#versioning)
 - [Usage](#usage)
   - [Prerequisites](#prerequisites)
   - [Adding the Library to Your Project](#adding-the-libraries-to-your-project)
@@ -37,6 +38,9 @@ There shouldn't be any Node compatibility issues with this package, but it's a g
 
 <img src="https://user-images.githubusercontent.com/3964455/55345820-c520a280-54a8-11e9-8235-407199fa1d97.png" alt="Encryption of sensitive data" width="75%" height="75%"/>
 
+### Versioning and Deprecation Policy <a name="versioning"></a>
+* [Mastercard Versioning and Deprecation Policy](https://github.com/Mastercard/.github/blob/main/CLIENT_LIBRARY_DEPRECATION_POLICY.md)
+
 ## Usage <a name="usage"></a>
 
 ### Prerequisites <a name="prerequisites"></a>