Add docker installation notes

Author: faithngetich

docker/README.md

@@ -1,11 +1,43 @@
 # How to use docker to spin up WebSiteOne
 
+## Prerequisites
+
+In order to run this container you'll need docker installation
+* [Windows](https://docs.docker.com/docker-for-windows/)
+* [OS X](https://docs.docker.com/docker-for-mac/)
+* [Linux](https://docs.docker.com/linux/started/)
+
+## Setup your environment variables
+
+Create a .env file at the root of your directory.
+
+``` 
+touch .env
+```
+
+* You'll have to get the `.env` file content from one of the admins: @tansaku or @diraulo.  The project won't work without it.  You can send them a direct message (DM) on Slack.  The `.env` file should go in the root of the WSO project.
+* Add the following to that file:
+
+```
+RECAPTCHA_SITE_KEY=6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI
+RECAPTCHA_SECRET_KEY=6LeIxAcTAAAAAGG-vFI1TnRWxMZNFuojJ4WifJWe
+AIRBRAKE_API_KEY=blahblahblah
+AIRBRAKE_PROJECT_ID=123
+SECRET_KEY_BASE=blabla
+RACK_TIMEOUT_SERVICE_TIMEOUT=200000000
+```
+
+the above are test keys from https://developers.google.com/recaptcha/docs/faq
+
 ## Setup docker
 
 Execute this setup just for the first time, or when you want to recreate everything from scratch.
 
 **BE AWARE IT WILL DELETE ALL YOUR DATA, including the Postgres Database.**
 
+
+
+
 ```
 $ ./docker/setup.sh
 ```