'git mv' rst resources to md

This is mainly intended to keep the git history as neat as possible.
No actual conversion yet, so now both the rst and the paradox docs
are broken, which will be fixed in the next commits.

akka-docs/src/main/paradox/java/code/jdocs/persistence/PersistenceEventAdapterDocTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2015-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+
+package jdocs.persistence;
+
+import akka.persistence.journal.EventAdapter;
+import akka.persistence.journal.EventSeq;
+
+public class PersistenceEventAdapterDocTest {
+
+  @SuppressWarnings("unused")
+  static
+  //#identity-event-adapter
+  class MyEventAdapter implements EventAdapter {
+    @Override
+    public String manifest(Object event) {
+      return ""; // if no manifest needed, return ""
+    }
+
+    @Override
+    public Object toJournal(Object event) {
+      return event; // identity
+    }
+
+    @Override
+    public EventSeq fromJournal(Object event, String manifest) {
+      return EventSeq.single(event); // identity
+    }
+  }
+  //#identity-event-adapter
+}