Update docs and changelog.

CHANGELOG.md

@@ -17,6 +17,8 @@ a Service/Application another machine.
 SessionManager.
 - Permission System - each action can define criteria that will be used to permit or deny agent actions.
 - File System - ability to emulate a node's file system during a simulation
+- Example notebooks - There is currently 1 jupyter notebook which walks through using PrimAITE
+  1. Creating a simulation - this notebook explains how to build up a simulation using the Python package. (WIP)
 
 ## [2.0.0] - 2023-07-26
 

docs/source/simulation_structure.rst

@@ -7,11 +7,19 @@ Simulation Structure
 ====================
 
 The simulation is made up of many smaller components which are related to each other in a tree-like structure. At the
-top level, there is an object called the ``SimulationController`` _(doesn't exist yet)_, which has a physical network
-and a software controller for managing software and users.
+top level, there is the :py:meth:`primaite.simulator.sim_container.Simulation`, which keeps track of the physical network
+and a domain controller for managing software and users.
 
-Each node of the simulation 'tree' has responsibility for creating, deleting, and updating its direct descendants.
+Each node of the simulation 'tree' has responsibility for creating, deleting, and updating its direct descendants. Also,
+when a component's ``describe_state()`` method is called, it will include the state of its descendants. The
+``apply_action()`` method can be used to act on a component or one of its descendatnts. The diagram below shows the
+relationship between components.
 
+.. image:: _static/component_relationship.png
+    :width: 500
+    :alt: The top level simulation object owns a NetworkContainer and a DomainController. The DomainController has a
+    list of accounts. The network container has links and nodes. Nodes can own switchports, NICs, FileSystem,
+    Application, Service, and Process.
 
 
 Actions