Updated README and added a gitignore file

.gitignore

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+*.swp

README.md

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 # docker-powerdns
-PowerDNS docker container
+PowerDNS docker container, based on Debian Jessie.
+
+## Requirements
+
+### Docker
+
+To use this image you need docker daemon installed. Run the following commands as root:
+
+```
+curl -ssl https://get.docker.com | sh
+```
+
+### Docker-compose
+
+Docker-compose is desirable (run as root as well):
+
+```
+curl -L https://github.com/docker/compose/releases/download/1.7.1/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
+```
+
+## Docker-compose Example
+
+Save the following snippet as docker-compose.yaml in any folder you like, or clone this repository, which contains the same file.
+
+```
+pdns:
+  build: pdns
+  links:
+    - "mysql:mysql"
+  ports:
+    - "53:53"
+    - "53:53/udp"
+mysql:
+  image: mysql
+  environment:
+    - MYSQL_ROOT_PASSWORD=mysqlrootpw
+    - MYSQL_DATABASE=pdns
+    - MYSQL_USER=pdns
+    - MYSQL_PASSWORD=pdnspw
+```
+
+## Running
+
+```
+cd <folder where docker-compose.yaml is>
+docker-compose up -d
+```
+
+## Contributing
+
+Pull requests welcome!
+