Add README, initialise repo.

Author: Paddy Carver

README.md

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+# terraform-protocol-go
+
+terraform-protocol-go provides low-level Go bindings for the Terraform
+protocol, for integrations to be built upon. It strives to be a minimal
+possible abstraction on top of the protocol, only hiding the implementation
+details of the protocol while leaving its semantics unchanged.
+
+## Status
+
+This project is experimental right now. It should not be relied upon in
+production.