Merge pull request #151 from 2byrds/diagram_component_interaction

Adding architecture diagram based on README description

arch_diagram.md

@@ -0,0 +1,25 @@
+```mermaid
+%%{init: {'theme':'neutral'}}%%
+graph
+    subgraph browser
+    EXTUI([Extension UI\nSensitive data allowed\nNo external scripts!!!])-- Signed Header requests -->BSCRIPT[\Background script - message coordinator\nSensitive data allowed\]
+    SIGN([User Signing Assocation]) --> EXTUI
+    AID([User selected identifier]) --> SIGN
+    CRED([User selected credential]) --> SIGN
+    AUTO([User selected auto-signin]) --> SIGN
+    PASS([User Passcode])--Temporarily Stored-->EXTUI
+        subgraph example web app
+        CONTENT[\Content Script\]-- Active tab\nmessages-->BSCRIPT;
+        WEBPG{{Web Page}}-- Active tab +\nSigning Assoc-->BSCRIPT;
+        CONTENT --> DIALOG[\Dialog HTML\];
+        DIALOG --> WEBPG;
+        end
+    end
+    BSCRIPT-- Boot Agent -->AGENT{{KERIA Agent}};
+    BSCRIPT-- Signed Header requests -->AGENT{{KERIA Agent}};
+    AGENT{{KERIA Agent}}-- Identifiers -->BSCRIPT;
+    AGENT{{KERIA Agent}}-- Credentials -->BSCRIPT;
+
+    BSCRIPT-- Identifiers -->EXTUI;
+    BSCRIPT-- Credentials -->EXTUI;
+```