fix: Update readme

README.md

@@ -1,6 +1,18 @@
 # Djangonix ❄️
 
-Nix expression to declaratively deploy django applications
+Nix expression to declaratively deploy django applications.
+
+## How it works
+
+The main issue for deploying declarative django applications is the pass secrets to the settings.
+
+This opinionated module tackles this issue by building an ad-hox settings
+module that re-exports the settings.py from the app and overrides some settings
+using the [loadcredential python module](https://github.com/Tom-Hubrecht/loadcredential).
+The settings to be overriden are provided by the user through the module.
+
+With this you should be able to deploy almost any django application without any
+modification of the `settings.py` file.
 
 ## Exemple
 
@@ -16,4 +28,7 @@ nix-build test.nix
 ## TODO
 
 - Hardening
+- Add a logic to change `INSTALLED_APPS` and `MIDDLEWARE` easily (the idea is to be able to remove developpement apps at no cost)
+- Add test case for runtimeSettings (it is probably broken for now)
+- Add test case for static assets
 - Remove all TODOs