Explain how to run individual tests and access psql (#570)
Explain how to run individual tests and access psql (#570)

Also, clarify that there are two containers, web and db,
rather than just one; these can be viewed using
docker ps
RefugeRestrooms/refugerestrooms,RefugeRestrooms/refugerestrooms,RefugeRestrooms/refugerestrooms,RefugeRestrooms/refugerestrooms