chore: initial push to be able to work together

sample/sample.tfrc.example

@@ -0,0 +1,10 @@
+provider_installation {
+   dev_overrides {
+      "registry.terraform.io/stackitcloud/stackitalpha" = "<CURRENT PROJECT PATH>/bin/"
+   }
+
+   # For all other providers, install them directly from their origin provider
+   # registries as normal. If you omit this, Terraform will _only_ use
+   # the dev_overrides block, and so no other providers will be available.
+   direct {}
+}