feat(docs): add a skeleton readme file

README.md

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+# fxa-relier-tests
+
+Functional tests for Firefox Accounts OAuth reliers.
+
+* [What's this?](#whats-this)
+* [How does it work](#how-does-it-work)
+
+## What's this?
+
+We have functional tests in [fxa-content-server](https://github.com/mozilla/fxa-content-server),
+which use a dummy project as an OAuth relier,
+called [123done](https://github.com/mozilla/123done).
+This repo is an experiment
+to see if we can make those tests
+more generally usable
+to real reliers.
+
+## How does it work?
+
+There is a shell script, [run.sh](run.sh),
+which clones the content server repo
+and runs the OAuth tests against 123done.
+If you set the environment variables
+`FXA_TRUSTED_RELIER_URL` or `FXA_UNTRUSTED_RELIER_URL`,
+it will try to run the same tests
+against any URL of your choosing.
+Right now that fails
+because all of the element selectors
+are hard-coded to work with 123done markup.
+But if we could templatize those selectors,
+we might get close to something usable.