Create raspberrypi.md (#555)

docs/raspberrypi.md

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+(I'm running it on a Raspberry Pi 3 with Raspbian Stretch)
+
+**1. Install nodejs.** 
+http://thisdavej.com/beginners-guide-to-installing-node-js-on-a-raspberry-pi/
+
+**2. Install docker and docker-compose.**
+Docker:
+https://blog.alexellis.io/getting-started-with-docker-on-raspberry-pi/
+Docker-compose instructions at the end of this page:
+https://pixelchrome.org/blog/quickstart-guide-how-to-install-docker-a-raspberry-pi/
+
+**3. Install this or another mongodb dockerfile made for the rapsberry pi.**
+https://hub.docker.com/r/nonoroazoro/rpi-mongo/
+
+**4.Rename the mongodb dockerfile to "mongo"** so that the conf.js from zenbot works with it.
+In my case:
+`docker tag nonoroazoro/rpi-mongo:latest mongo:latest`
+
+**5.Run the mongo dockerfile.**
+`docker run mongo`
+(You can control-c or command-c to close the dialogue after it stays at "waiting for connections on port 27017") 
+`docker ps`
+to make sure mongo is running
+
+**6. Run zenbot.**
+`cd zenbot`
+`docker-compose build`
+`docker-compose up -d`
+
+Commands are the same
+`docker run --rm --link zenbot_mongodb_1:mongodb -it zenbot_server ./zenbot.sh [command]`
+
+
+There ya go