Add use cases section.

Author: msporny

index.html

@@ -295,7 +295,33 @@ <h2>Goals</h2>
         <h2>Use Cases and Requirements</h2>
 
         <p>
+The following use cases have been identified as ones that this specification
+is capable of addressing.
         </p>
+
+        <dl>
+          <dt>DID Document Change Log</dt>
+          <dd>
+Stephen is creating a new DID Method and would like to provide an independently
+verifiable cryptographic log file for DID Document changes.
+          </dd>
+          <dt>Social Web Posting Change Log</dt>
+          <dd>
+Christine is launching a new social network and would like to provide a way of
+publishing content that is portable across providers.
+          </dd>
+          <dt>Portable Account Data</dt>
+          <dd>
+Paul would like to enable the people that use his service to easily move their
+content history to other services.
+          </dd>
+          <dt>Journalism Witnessing</dt>
+          <dd>
+Georg is a journalist that archives media from a variety of news outlets and
+would like to provide a witnessing service to prove when certain events
+happened in history.
+          </dd>
+        </dl>
       </section>
 
       <section id="conformance">