Update README.md

Author: antoinevulcain

README.md

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   Financial Modeling Prep API
 </h1>
 
-<h4>A <a href="https://financialmodelingprep.com/developer/docs">financial statement API</a> free for everyone, you can also find real-time stock prices and historical stock data prices.</h4>
+<h4>A <a href="https://financialmodelingprep.com/developer/docs">financial statement API</a> free for everyone, you can also find real-time stock prices and historical stock data prices, you can create an apikey on the documentation to start using this <a href="https://financialmodelingprep.com/developer/docs"> stock API</a> </h4>
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 📖Official page: https://financialmodelingprep.com/developer/docs 
 🛠Support: [email protected]