distro specific readme

Signed-off-by: Thomas Sjögren <konstruktoid@users.noreply.github.com>

distros/README.md

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+# Distribution specific Dockerfiles
+
+## Requirements
+
+### Keep your images up-to-date
+Use the distribution package manager to keep your image up-to-date.
+
+### REPOSITORY
+Add a `REPOSITORY` comment with the URL to your GitHub repository where the Dockerfile is present.   
+`# REPOSITORY <GitHub repository>`  
+
+### MAINTAINER
+Add the `MAINTAINER` instruction and your contact details, GitHub aliases are acceptable.   
+
+## Example Dockerfile
+
+```sh
+# REPOSITORY https://github.com/docker/docker-bench-security
+
+MAINTAINER dockerbench.com
+
+FROM alpine:3.1
+
+RUN apk update && \
+    apk upgrade && \
+    apk --update add docker
+
+RUN mkdir /docker-bench-security
+
+COPY . /docker-bench-security
+
+WORKDIR /docker-bench-security
+
+ENTRYPOINT ["/bin/sh", "docker-bench-security.sh"]
+```