contrib: add CA manager states diagram

contributing/service-mesh/ca/README.md

@@ -101,3 +101,14 @@ Periodic (or background) opeartions are started automatically by the Consul lead
 ####TODO:
 - sequence diagram for leaf signing 
 - sequence diagram for CA cert rotation
+
+## CAManager states
+
+This section is a work in progress
+
+TODO: style the diagram to match the others, and add some narative text to describe the
+diagram.
+
+![CA Mananger states](./state-machine.svg)
+
+

contributing/service-mesh/ca/state-machine.mmd

@@ -0,0 +1,23 @@
+stateDiagram-v2
+
+    [*] --> Uninitialized
+    Uninitialized --> Initializing : InitializeCA
+    Uninitialized --> Reconfig : UpdateConfiguration
+    Reconfig --> Uninitialized : return
+
+    # Initialized can transition to any state
+    Initialized --> Renew : RenewIntermediate
+    Initialized --> Uninitialized : Stop
+    Initialized --> Reconfig  : UpdateConfiguration
+    Initialized --> Initializing : INVALID
+
+    # Initialized is set using validate=false
+    Uninitialized --> Initialized : INVALID
+    Reconfig --> Initialized : return
+    Initializing --> Initialized : InitializeCA complete
+    Renew --> Initialized : return
+
+    # Uninitialized is set using validate=false
+    Renew --> Uninitialized : Stop
+    Reconfig --> Uninitialized : Stop
+    Initializing --> Uninitialized : Stop