Update README.md

README.md

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 Welcome to the Trading App prototype! This application provides users with real-time data for various company stocks, allowing them to make informed decisions on buying and selling. If the stock price meets the user's criteria, the app will send a signal to buy or sell stocks according to the user's specified limit. Additionally, users can obtain the cost of the stock based on the current price when a signal is sent.
 
+[Documentation on building Trading App in C++](https://iq.opengenus.org/trading-application-in-cpp/) step by step. This tool has been developed by OG intern Vidhi Srivastava.
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 ![Screenshot](./output.png)
 
 ## Table of Contents
@@ -88,7 +90,7 @@ Before running the Trading App, make sure you have the following prerequisites i
 
 - **JsonCpp library:** Install the JsonCpp library for JSON parsing and manipulation in C++.
 
-- **API Key:** Sign up at [Twelve Data](https://twelvedata.com/stocks) to obtain your own API key. Place your API key in the `config.json` file.
+- **API Key:** Sign up at Twelve Data to obtain your own API key. Place your API key in the `config.json` file.
 
 ## Authors 👤