Add Docker config file and documentation

docs/docker.markdown

@@ -0,0 +1,48 @@
+How to test Kanboard with Docker?
+=================================
+
+Kanboard can run with [Docker](https://www.docker.com).
+You can use the public image or build your own image from the `Dockerfile`.
+
+Actually, the Docker image is based on the master branch (development version).
+
+Build your own Docker image
+---------------------------
+
+From your kanboard directory run the following command:
+
+```bash
+docker build -t youruser\kanboard:master .
+```
+
+To run your image in background on the port 80:
+
+```bash
+docker run -d --name kanboard -p 80:80 -t youruser/kanboard:master
+```
+
+Run the public Kanboard image
+-----------------------------
+
+This image is stored on the [Docker Hub](https://hub.docker.com).
+
+Fetch the image on your machine:
+
+```bash
+docker pull kanboard/kanboard:master
+```
+
+Run the image:
+
+```bash
+docker run -d --name kanboard -p 80:80 -t kanboard/kanboard:master
+```
+
+Store your data on a volume
+---------------------------
+
+You can also save your data outside of the container, on the local machine:
+
+```bash
+docker run -d --name kanboard -v /your/local/data/folder:/var/www/html/data -p 80:80 -t kanboard/kanboard:master
+```