Implement read-only Dynu Terraform provider skeleton

examples/provider/provider.tf

@@ -0,0 +1,9 @@
+provider "dynu" {
+  # api_key can be omitted when DYNU_API_KEY is set
+  api_key = var.dynu_api_key
+}
+
+variable "dynu_api_key" {
+  type      = string
+  sensitive = true
+}