Fix Docs (pdf to markdown)

docs/RestAPI.md → docs/REST_API.md

@@ -12,7 +12,7 @@
 |              | Customize      | customize font, background color |
 | Customize themes | Customize preview | Show preview based on present font, </br>background color |
 |                  | Save customization | Save present font, background color |
-<br/>
+---
 
 ## REST API
 ```

docs/architecture.md

@@ -0,0 +1,19 @@
+```mermaid
+%%{init: {'securityLevel': 'loose', 'theme':'base'}}%%
+        sequenceDiagram
+          autonumber
+          par Use CLI
+            Controller->>User: Web Socket
+            User->>Controller: Web Socket
+          and Login, Customizing
+            User->>Controller: Request
+            Note right of Controller: Perl - Mojolicious
+            Controller->>Model: ssh, user, IP addr
+            Note right of Model: Perl - Mojolicious
+            Model->>Controller: Response
+            Controller->>View: Request
+            Note right of View: React.js
+            View->>User: Response
+
+          end
+```