Update README.md

Author: Matt Bernier

README.md

@@ -85,14 +85,20 @@ Console.WriteLine(response.StatusCode);
 Console.WriteLine(response.Body.ReadAsStringAsync().Result);
 Console.WriteLine(response.Headers.ToString());
 ```
-
-You can use the ```.env_example``` file located at "examples" folder. Just copy it to a ```.env``` folder ou can put on your project's root.
-
 <a name="usage"></a>
 # Usage
 
 - [Example Code](https://github.com/sendgrid/csharp-http-client/blob/master/Example/Example.cs)
 
+## Environment Variables 
+
+You can do the following to create a .env file:
+
+```cp .env_example .env```
+
+Then, just add your API Key into your .env file.
+
+
 <a name="roadmap"></a>
 # Roadmap
 
@@ -123,4 +129,4 @@ csharp-http-client is guided and supported by the SendGrid [Developer Experience
 csharp-http-client is maintained and funded by SendGrid, Inc. The names and logos for csharp-http-client are trademarks of SendGrid, Inc.
 
 # License
-[The MIT License (MIT)](LICENSE.txt)
+[The MIT License (MIT)](LICENSE.txt)