Add README and GNUmakefile

GNUmakefile

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+# Copyright (c) HashiCorp, Inc.
+# SPDX-License-Identifier: MPL-2.0
+
+# Modifications copyright (c) Enthought, Inc.
+# SPDX-License-Identifier:	BSD-3-Clause
+
+default: testacc
+
+# Run acceptance tests
+.PHONY: testacc
+testacc:
+	TF_ACC=1 go test ./... -v $(TESTARGS) -timeout 120m
+
+# Generate Quay API
+.PHONY: generate-quay-api
+generate-quay-api:
+	openapi-generator generate --generator-name go --git-user-id enthought --git-repo-id terraform-provider-quay --additional-properties=packageName=quay_api,isGoSubmodule=true --skip-validate-spec --input-spec code_generator/quay_api.json --output quay_api && \
+    gofmt -w quay_api && \
+    cd quay_api && \
+    go mod tidy

README.md

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+# terraform-provider-quay
+Terraform provider for the [Quay Project](https://github.com/quay/quay).
+
+Please visit the Terraform registry site for instructions on how to use the provider:
+
+https://registry.terraform.io/providers/enthought/quay/latest/docs
+
+## Developer Instructions
+### Build Documentation
+The documentation should be updated every time the provider code is changed.
+```bash
+go generate .
+```
+
+### Run Tests
+```bash
+export QUAY_URL="https://quay.example.com"
+export QUAY_TOKEN=""
+make testacc
+```
+
+### Generate Quay API
+```bash
+make generate-quay-api
+```