docs(boxsdkgen): Link configuration docs in Readme (box/box-codegen#917) (#1700)

Co-authored-by: box-sdk-build <box-sdk-build@box.com>
Co-authored-by: Minh Nguyen Cong <mcong@box.com>

Author: 3 people

docs/sdkgen/README.md

@@ -1,6 +1,14 @@
 # Documentation
 
-## High-level Documentation
+## Configuration
+
+This section covers the documentation required to get up and running with the SDK, including configuration, authentication, and client initialization for making API calls.
+
+* [Configuration](Configuration.md)
+* [Authentication](Authentication.md)
+* [Client](Client.md)
+
+## Box API Usage
 
 General explanations of the available functionality and examples of how to use
 the SDK are available by topic: