Update README.md

README.md

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 # terraform-provider-unifi
 
-This is very much WIP, just adding functionality as I need it for my local setup.
-
 **Note** You can't (for obvious reasons) configure your network while connected to something that may disconnect (like the WiFi). Use a hard-wired connection to your controller to use this provider.
 
 Functionality first needs to be added to the [go-unifi](https://github.com/paultyng/go-unifi) SDK.
 
+## Documentation
+
+You can browse documentation on the [Terraform provider registry](https://registry.terraform.io/providers/paultyng/unifi).
+
 ## Using the Provider
 
+### Terraform 0.13 and above
+
+You can use the provider via the [Terraform provider registry](https://registry.terraform.io/providers/paultyng/unifi).
+
+### Terraform 0.12 or manual installation
+
 You can download a pre-built binary from the [releases](https://github.com/paultyng/terraform-provider-unifi/releases) page, these are built using [goreleaser](https://goreleaser.com/) (the [configuration](.goreleaser.yml) is in the repo). You can verify the signature and my [key ownership via Keybase](https://keybase.io/paultyng).
 
 If you want to build from source, you can simply use `go build` in the root of the repository.