Update README.md

- Adds information and link for obtaining the `refresh_token` in the docs.
- Adds information and link for obtaining the `access_token`on VMware {code}.

Signed-off-by: Ryan Johnson <[email protected]>

Author: Ryan Johnson

README.md

@@ -19,6 +19,12 @@ See [Installing the Terraform Provider for VMware vRealize Automation](docs/inst
 
 For either installation method, documentation about the provider configuration, resources, and data sources can be found on the [provider page](https://registry.terraform.io/providers/vmware/vra/latest/docs) on the Terraform Registry.
 
+The provider accepts either a `refresh_token` or an `access_token` to interact with the vRealize Automation API, but not both at the same time. 
+
+* For more information on obtaining a `refresh_token` for the provider configuration the provider, see [Get Your Refresh Token for the vRealize Automation API](docs/refresh_token.md).
+
+* For more information on obtaining an `access_token` for the provider configuration, see [Get Your Access Token for the vRealize Automation API](https://code.vmware.com/docs/14701/vrealize-automation-8-6-api-programming-guide/GUID-AC1E4407-6139-412A-B4AA-1F102942EA94.html) on VMware {code}.
+
 Examples on the use of the provider configuration, resources, and data sources can be found in the project's  `examples` directory.
 
 ## Upgrading the Provider