From 8ad92377c74c92fd0916697abbd445af1390634b Mon Sep 17 00:00:00 2001
From: rcholic <ivytony@gmail.com>
Date: Tue, 4 Jun 2024 20:18:50 -0700
Subject: [PATCH] readme example

---
 README.md | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/README.md b/README.md
index d6e8c4a..6363e1a 100644
--- a/README.md
+++ b/README.md
@@ -17,3 +17,36 @@ This is a Python client library for accessing the Charles Schwab stock and optio
 ## Installation
 
 To install the Charles Schwab API client, you can use pip:
+```
+pip install CSchwabPy
+```
+
+## Usage Example
+
+* Authentication & Get Access Token & Refresh Token
+
+```python
+
+# save these lines in a file named like cschwab.py
+from cschwabpy.SchwabAsyncClient import SchwabAsyncClient
+
+app_client_key = "---your-app-client-key-here-"
+app_secret = "app-secret"
+
+schwab_client = SchwabAsyncClient(app_client_id=app_client_key, app_secret=app_secret)
+schwab_client.get_tokens_manually()
+
+# run in your Terminal, follow the prompt to complete authentication:
+> python cschwab.py
+
+
+# now you should have access token & refresh token downloaded to your device
+
+#----------------
+# download SPX option chains
+from_date = 2024-07-01
+to_date = 2024-07-01
+ticker = '$SPX'
+asyncio.run(schwab_client.download_option_chain(ticker, from_date, to_date))
+
+```