Added another resource to the Further Reading

Author: banreyms

1.5 Zero trust.md

@@ -63,6 +63,8 @@ Defense in depth involves a combination of technical, procedural, and physical s
 
 ## Further reading
 
+[What is Zero Trust?](https://learn.microsoft.com/security/zero-trust/zero-trust-overview?WT.mc_id=academic-96948-sayoung)
+
 [Evolving Zero Trust – Microsoft Position Paper](https://query.prod.cms.rt.microsoft.com/cms/api/am/binary/RWJJdT?WT.mc_id=academic-96948-sayoung)
 
 [Zero Trust and BeyondCorp Google Cloud | Google Cloud Blog](https://cloud.google.com/blog/topics/developers-practitioners/zero-trust-and-beyondcorp-google-cloud)