Start Ghost Inspector README with details extracted from main README

uitests/README.md

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+# Ghost Inspector Readme
+
+To run the Ghost Inspector tests against a local instance of AT-AT,
+you will need the following:
+
+- [docker](https://docs.docker.com/v17.12/install/)
+- [circleci CLI tool](https://circleci.com/docs/2.0/local-cli/#installation)
+- the prerequisite variable information listed [here](https://ghostinspector.com/docs/integration/circle-ci/)
+
+The version of our CircleCI config (2.1) is incompatible with the
+`circleci` tool. First run:
+
+```
+circleci config process .circleci/config.yml > local-ci.yml
+```
+
+Then run the job:
+
+```
+circleci local execute -e GI_SUITE=<SUITE_ID> -e GI_API_KEY=<API KEY> -e NGROK_TOKEN=<NGROK TOKEN> --job integration-tests -c local-ci.yml
+```
+
+If the job fails and you want to re-run it, you may receive errors
+about running docker containers or the network already existing.
+Some version of the following should reset your local docker state:
+
+```
+docker container stop redis postgres test-atat; docker container rm redis postgres test-atat ; docker network rm atat
+```