added dockerfile for development (#377)

var/docs/docker.md

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+# Docker
+
+We bundle a simple docker that can be used for test purposes.  Either pull it from docker hub or build it.
+
+## Build the docker
+
+    docker build -t kimai/kimai2:dev .
+
+## Run the docker
+
+    docker run -ti -p 8001:8001 --name kimai2 --rm kimai/kimai2:dev
+
+You can then access the site on http://127.0.0.1:8001. If that doesn't work check the IP of your docker:
+
+    docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' kimai2
+
+You can find Kimai at that IP on port 8001.
+
+### Mac using docker-machine
+
+When using dock-machine on your Mac, you need to use the IP of your machine. 
+Considering you started the machine named `default`, you find the IP with:
+
+    docker-machine ip default
+
+## Running commands in the docker
+
+You can run any command in the container in this fashion once it is started.  Add `-ti` to attach a terminal.
+
+    docker exec -ti kimai2 bash
+
+## Create a user and dummy data
+
+See the docs [here](installation.md) for full instructions, but this creates a user admin/admin with all privileges.
+
+    docker exec kimai2 bin/console kimai:create-user admin admin@example.com ROLE_SUPER_ADMIN admin
+
+To install the fixtures:
+
+    docker exec kimai2 bin/console kimai:reset-dev
+
+## Developing against the docker
+
+It is possible to mount your source tree and sqlite DB into the container at run time.
+
+    docker run --rm -d -p 8001:8001 \
+        -v $(pwd)/src:/opt/kimai/src \
+        -v $(pwd)/var/data/kimai.sqlite:/opt/kimai/var/data/kimai.sqlite \
+        --name kimai2 kimai/kimai2:dev
+
+Now edits in the local file tree will be served by the container and database changes will persist.
+
+See [The official docker documentation](https://docs.docker.com/) for more options on running the container.