Updated Architecture (markdown)

Architecture.md

@@ -11,6 +11,9 @@
 - **Worker Core** can do all evaluating steps and is responsible for security of them. Sandbox [Isolate](https://github.com/ioi/isolate) is used.
 - **File Server Frontend** ensures via **File API** access to files on **File Server**, where are stored testing inputs and corresponding outputs for each task and other required files. It's possible to upload files, too.
 
+### Internal Worker architecture
+![Internal Worker architecture](https://github.com/ReCodEx/GlobalWiki/blob/master/images/Worker_Internal_Architecture.png)
+
 ## File Server
 ![File Server Infrastructure](https://github.com/ReCodEx/GlobalWiki/blob/master/images/File_Server.png)