Add basic readme.

docker/DOCKER.md

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+# Docker support
+This is a updated version of the current docker support.
+Container support is only for development purposes and should not be used in production without your own modificatins.
+
+It's not needed to reload the container after you make changes in your current branch.
+
+Images are currently not available in docker hub or other repository, so you have to build them yourself.
+
+After a successful launch PowerDNS-Admin is reachable at http://localhost:9393
+
+PowerDNS runs op port localhost upd/5353
+
+
+## Basic commands:
+### Build images
+cd to this directory
+
+```# ./build-images.sh```
+
+### Run containers
+Build the images before you run this command.
+
+```# docker-compose up```
+
+### Stop containers
+```# docker-compose stop```
+
+### Remove containers
+```# docker-compose rm```