Add short doc for the sqlanalytics/api package

Author: pietern

sqlanalytics/api/api.go

@@ -0,0 +1,10 @@
+// Package api contains API structures for use with the SQL Analytics API.
+//
+// These are not intended to be used directly.
+//
+// They are kept in a separate package to avoid confusion between the
+// Terraform resources and the API objects. While their structure is
+// very similar, there are a handful of nuanced differences to improve
+// the UX of the Terraform resource.
+//
+package api