Merge pull request #29 from jadesingh/readme-update-28

Updated README with instructions on how to use Redis via Docker Compose #28

Closes #28.

Author: SuzeShardlow

README.md

@@ -29,6 +29,21 @@ To get started:
 ```
 $ npm install
 ```
+You'll also need to have the RedisTimeSeries module installed, which you can get by going through the following steps:
+- Install [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/)
+- Check your Docker Compose version using ```docker-compose --version```.  In order for our compose file to work, you need to have at least v1.27.0.  
+- Start up the Docker daemon.  
+- Run ```docker-compose up -d``` in the project directory.  This command will give you Redis on localhost port 6379 with no password required, with the required RedisTimeSeries module installed.  The container will persist Redis data to the ```redisdata``` folder.
+
+You should see the following once the command has successfully run:
+
+<img src=docker-compose.png width="450" height="200">
+
+You'll also see the ```ru102js``` container running if you open up the Docker app.  
+
+If you get an error that says something like ```Version in "./docker-compose.yml" is unsupported```, you probably need to update your docker compose version to 1.27.0 or higher.
+
+If you want to shut down the Redis container, you can run ```docker-compose down```.
 
 # Configuration