Expand the project structure diagram on the readme.

README.md

@@ -17,16 +17,42 @@ Documentation is still a work in progress. In general,
 
 You may notice that Etiquette doesn't have a version number anywhere. That's because I don't think it's ready for one. I am using this project to learn and practice, and breaking changes are very common.
 
-### Project Structure
+### Project structure
+
+Here is a brief overview of the project 
 
 - `etiquette`  
     The core backend package.
+    - `constants`  
+        Strings, messages, column layouts, and other things that are constant during runtime.
+    - `decorators`  
+        Function decorators.
+    - `exceptions`  
+        Exception classes.
+    - `helpers`  
+        A variety of small, useful functions that wouldn't belong as a method on any class.
+    - `jsonify`  
+        Toolkit for serializing the Etiquette objects as JSON.
+    - `objects`  
+        Definition of the Etiquette data objects like Photos and Tags.
+    - `photodb`  
+        Definition of the PhotoDB class and its Mixins.
+    - `searchhelpers`  
+        A variety of validation, normalization, and processing functions used to handle search queries.
+    - `tag_export`  
+        Toolkit for exporting a PDB's tagset into a different formats e.g. varying levels of nesting or depicting tags with their full qualified names.
 - `frontends`  
     Ideally the backend should be frontend-agnostic. Even though the Flask interface is my primary interest, it should not feel like it must be the only one. Therefore I place it in this folder to indicate that other frontends are possible too.
     - `etiquette_flask`  
     This folder represents the flask server as somewhat of a black box, in the sense that you can move it around and just run the contained launch file.
         - `etiquette_flask`  
-        This is the package that contains all of the site's actual API code.
+            This is the package that contains all of the site's actual API code.
+        - `static`  
+            User-facing, static, cacheable content like CSS, JS, and graphics.
+        - `templates`  
+            Jinja HTML templates, including reusable subunits as macros.
+    - `etiquette_repl`  
+        Preloads a few variables into the interpreter so you can quickly test functions within the Python REPL itself.
 - `utilities`  
     For other scripts that will be used with etiquette databases, but are not part of the library itself.