Update README.md

README.md

@@ -16,16 +16,42 @@ pip install dash-auth-external
 ```
 ## Simple Usage
 ```
-auth = DashAuthExternal()
-
-
-server = 
+#using spotify as an example
+AUTH_URL = "https://accounts.spotify.com/authorize"
+TOKEN_URL = "https://accounts.spotify.com/api/token"
+CLIENT_ID = "YOUR_CLIENT_ID"
 
+# creating the instance of our auth class
+auth = DashAuthExternal(AUTH_URL, TOKEN_URL, CLIENT_ID)
+```
+We then pass the flask server from this object to dash on init.
+```
+app = Dash(__name__, server=server)
+```
+That's it! You can now define your layout and callbacks as usual. 
+> To obtain your access token, call the get_token method of your Auth object.
+> **NOTE** This can **ONLY** be done in the context of a dash callback.
+```
 
+app.layout = html.Div(
+[
+html.Div(id="example-output"), 
+dcc.Input(id="example-input")
+])
+
+@app.callback(
+Output("example-output", "children"),
+Input("example-input", "value")
+)
+def example_callback(value):
+    token = (
+        auth.get_token()
+    )  ##The token can only be retrieved in the context of a dash callback
+    return token
+```
 
 
 
-```