Write README on how to use

Author: marlontrapp

README.rst

@@ -4,4 +4,60 @@ Frontend Settings
 Abstract
 --------
 
-Dynamic settings and feature flags for the frontend.
+This project provides an API that expose settings and feature flags for the frontend.
+
+It uses `django-drf` to create an endpoint to expose flags and settings configured in `django-waffle` and `django-constance`
+
+
+
+Usage
+-----
+
+Requirements
+Python (3.6, 3.7, 3.8, 3.9)
+Django (2.2, 3.0, 3.1, 3.2)
+
+Installation
+~~~~~~~~~~~~
+Install using pip:
+
+.. code::
+
+    pip install django-frontend-settings
+
+Add 'frontend-settings' to your INSTALLED_APPS setting.
+
+.. code:: python
+
+    INSTALLED_APPS = [
+        ...
+        'frontend-settings',
+    ]
+
+Expose the view in your urls:
+
+.. code:: python
+
+    from frontend_settings.views import settings as frontend_settings_view
+
+    url(r"^frontend-settings/", frontend_settings_view, name="frontend-settings"),
+
+
+Then your flags from waffle and setting from constance should be returned on a get in this route:
+
+
+.. code::
+
+    $ curl 'http://localhost:8000/frontend-settings/'
+    {"data":{"flags":{"MY_FEATURE_FLAG":true},"settings":{}}}
+
+
+In that case I had `FRONTEND_MY_FEATURE_FLAG` flag in waffle.
+The default prefix for flags is `FRONTEND_`, if you like to change it you can do by changing the following config on settings.py:
+
+.. code:: python
+
+    FRONTEND_SETTINGS = {
+        "WAFFLE_FLAG_PREFIX": "FRONTEND_", # Prefix used to filter out the flag that should be exposed in the endpoint
+        "CONSTANCE_KEY": "FRONTEND_SETTINGS", # Name of the settings in constance
+    }