added problem statement

spec.md

@@ -35,6 +35,17 @@ spec offers a straightforward yet effective discovery layer for both legacy and
 new trust registry services. The intended audience includes individuals or
 entities seeking to improve service interoperability with their existing services or on new services.
 
+### Problem Statement
+
+Current endpoint systems lack a clear method to identify the protocols a service
+supports. The DID Core Spec’s Service Endpoint type field is not sufficiently
+expressive for endpoints to fully understand what protocols a service endpoint
+supports. This specification addresses this gap in the DID Core specification by
+introducing a straightforward way for endpoints to indicate support of a
+protocol or service using a structured Profile Document Model. These documents
+are reusable, decentralized, and expressive documents that allow service
+providers to connect and interoperate with endpoint systems with less friction.
+
 ### Example
 
 In this example, we illustrate a practical example of profiles. We have a Service that