add a diagram of entity lifecycle to new doc

documentation/src/main/asciidoc/introduction/Interacting.adoc

@@ -48,6 +48,8 @@ Thus, an entity instance may be in one of three states with respect to a given p
 2. _persistent_ — currently associated with the persistence context, or
 3. _detached_ — previously persistent in another session, but not currently associated with _this_ persistence context.
 
+image:images/entity-lifecyle.png[width=800,align="center"]
+
 At any given moment, an instance may be associated with at most one persistence context.
 
 The lifetime of a persistence context usually corresponds to the lifetime of a transaction, though it's possible to have a persistence context that spans several database-level transactions that form a single logical unit of work.