Initial Docker Setup

If you haven't yet, install docker.
Clone the unc2020 github repo and cd to that location:
- git clone https://github.com/RepoCamp/unc2020.git
- cd unc2020
To start:
```
  docker-compose run web rails db:setup
  docker-compose up
```
Rails will be running on port 3000. Open a web browser and go to http://localhost:3000 and you should see a copy of the Hyrax application we'll be using for camp this week.
To run the test suite ("specs"), leave the processes running that you started with docker-compose up and open a new terminal window, then run:
```
  docker-compose run web rspec
```
To open a unix prompt on the docker instance, and in a new terminal window run:
```
  docker-compose run web bash
```

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