Update documentation with new configuration method

README.md

@@ -6,26 +6,20 @@ if they don't have the proper cookie set. This can be used to display a small
 marketing landing page, protect an alpha website from the public eye, make an
 announcement, etc.
 
-Meant to be used with https://github.com/edx/edx-platform/
+Meant to be used with https://github.com/edx/edx-platform/ -- or you will need 
+to import the config_models application to your Django application:
+https://github.com/edx/edx-platform/tree/master/common/djangoapps/config_models
 
 ### Installation
 
-Add the following configuration variables:
+Add the application to the `INSTALLED_APPS`:
 
 ```python
-############################### Splash screen ####################################
-
-SPLASH_SCREEN_COOKIE_NAME = 'edx_splash_screen'
-
-# The user cookie value must match one of the values to not be redirected to the
-# splash screen URL
-SPLASH_SCREEN_COOKIE_ALLOWED_VALUES = ['seen']
-
-# Users which should never be redirected (usernames)
-SPLASH_SCREEN_UNAFFECTED_USERS = []
-
-# The URL the users should be redirected to when they don't have the right cookie
-SPLASH_SCREEN_REDIRECT_URL = 'http://edx.org'
+INSTALLED_APPS = (
+    ...
+    # Splash screen
+    'splash',
+)
 ```
 
 Add the middleware to the configuration:
@@ -37,13 +31,18 @@ MIDDLEWARE_CLASSES = (
 )
 ```
 
-And to the `INSTALLED_APPS`:
+Run the migrations:
 
-```python
-INSTALLED_APPS = (
-    ...
-    # Splash screen
-    'splash',
-)
 ```
+$ ./manage.py migrate splash
+```
+
+Then go to your Django admin, in http://yourserver/admin/splash/splashconfig/add/
+and configure the following variables:
+
+* `enabled`: To activate the feature
+* `cookie_name`: The name of the cookie
+* `cookie_allowed_values`: The user cookie value must match one of the values to not be redirected to the splash screen URL
+* `unaffected_users`: Users which should never be redirected (usernames)
+* `redirect_url`: The URL the users should be redirected to when they don't have the right cookie