Added Dockerfile to containerize mondash

docker/Dockerfile

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+FROM golang
+
+MAINTAINER Knut Ahlers <knut@ahlers.me>
+
+RUN go get github.com/Luzifer/mondash && \
+    go install github.com/Luzifer/mondash
+
+EXPOSE 3000
+
+ENTRYPOINT ["/go/bin/mondash"]

docker/README.md

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+# luzifer/mondash Dockerfile
+
+This repository contains **Dockerfile** of [Luzifer/mondash](https://github.com/Luzifer/mondash) for [Docker](https://www.docker.com/)'s [automated build](https://registry.hub.docker.com/u/luzifer/mondash/) published to the public [Docker Hub Registry](https://registry.hub.docker.com/).
+
+## Base Docker Image
+
+- [golang](https://registry.hub.docker.com/_/golang/)
+
+## Installation
+
+1. Install [Docker](https://www.docker.com/).
+
+2. Download [automated build](https://registry.hub.docker.com/u/luzifer/mondash/) from public [Docker Hub Registry](https://registry.hub.docker.com/): `docker pull luzifer/mondash`
+
+## Usage
+
+To launch it, just replace the variables in following command and start the container:
+
+```
+docker run \
+         -e AWS_ACCESS_KEY_ID=myaccesskeyid \
+         -e AWS_SECRET_ACCESS_KEY=mysecretaccesskey \
+         -e S3Bucket=mybucketname \
+         -e BASE_URL=http://www.mondash.org \
+         -e API_TOKEN=yourownrandomtoken \
+         -p 80:3000 \
+         luzifer/mondash
+```
+
+Easy!
+