[nest] Add missing enable SDM API configuration step to README.md (#13931)

Fixes #11814

Signed-off-by: Wouter Born <github@maindrain.net>

diff --git a/bundles/org.openhab.binding.nest/README.md b/bundles/org.openhab.binding.nest/README.md
index c4142637d34e0149fb8a7c32304b57e6f4380291..fb407b1c167815292fd8ca81c239045e9bb5909b 100644 (file)
--- a/bundles/org.openhab.binding.nest/README.md
+++ b/bundles/org.openhab.binding.nest/README.md
@@ -104,7 +104,10 @@ Finally, an SDM Account Thing can be created to access the SDM project using the
 1. All required SDM Account Thing configuration parameters have now been entered so create it by clicking "Create Thing"
 
 The SDM Account Thing should now be ONLINE and have as status description "Using periodic refresh".
-It should also be possible to use the configured account to discover your Nest devices via the Inbox.
+
+Next click the "Enable" button on the [Smart Device Management API](https://console.cloud.google.com/apis/library/smartdevicemanagement.googleapis.com) page for your GCP project to enable the SDM API.
+
+Now it should also be possible to use the configured account to discover your Nest devices via the Inbox.
 
 You can monitor the SDM API using the Google Cloud Platform Console via [API & Services > Smart Device Management API](https://console.cloud.google.com/apis/api/smartdevicemanagement.googleapis.com/overview).