update readme

README.md

@@ -37,6 +37,19 @@ E.g.
 Linux: `ln -s /path/to/frontend/build /path/to/backend/files/build`  
 Windows (admin cmd) `mklink /D C:\Path\To\Backend\files\build C:\Path\To\Frontend\build`  
 
+## Src directory structure  
+- controller: Main controller, takes care of sharding and the shard life-cycles. Also instantiates the master process  
+    - commands: Commands you can issue to the controller  
+- server: Code running on the shards, most of the functionality lives here  
+    - components: Base components the server uses  
+    - database: Various database extensions, database interactions are primarily handled by [these wrappers](https://git.corgi.wtf/Navy.gif/wrappers)  
+    - endpoints: Endpoint functionality, can be organised into subfolders, or not  
+    - interfaces: Various interfaces and parent classes  
+    - middleware: Middleware functions and classes for express  
+    - structures: Abstractions for various API entities, e.g. user & role  
+- util: Shared utility functionality & misc stuff  
+    - errors: Error classes  
+
 ## TODO  
 - Dependency injection for structures, such as User.
 - Some kind of plugin system