Add README

Signed-off-by: Christopher Crone <[email protected]>

Author: chris-crone

README.md

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+# Compose specification compliance test suite
+
+This repository contains a test suite for testing Compose implementations to
+ensure that they correctly implement the Compose specification. The current
+state of the test suite is that it is a work in progress and contributions are
+welcome!
+
+## Getting started
+
+By default, the test suite is run against the
+[Compose reference implementation](https://github.com/compose-spec/compose-ref)
+which uses the Docker Engine.
+
+### Prerequisites
+
+* [Docker](https://docs.docker.com/install/)
+* [compose-ref](https://github.com/compose-spec/compose-ref) in your PATH
+* Ensure that you have no running containers (see [issue](https://github.com/compose-spec/compatibility-test-suite/issues/5))
+
+### Running the tests
+
+Using the defaults, you can run the tests as follows:
+
+```console
+$ make test
+```