Added Docker documentation to README.md

Author: Thomas Miller

README.md

@@ -136,7 +136,39 @@ For example:
 Docker
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-Docker section
+RDAP conformance can be executed as a Docker container. The docker container
+works by having a spec file mounted into the containers file system. The
+return code of the container can be used to determine success or failure.
+
+### Building the image
+
+The following command can be used to build an image.
+
+```
+docker build -t apnic/rdap-conformance .
+```
+
+### Running the container
+
+To run the Docker container.
+
+```
+docker run -d -v "<path_to_spec.json>:/app/rdap-spec.json" 
+--name rdap-conformance apnic/rdap-conformance
+```
+
+<aside class="notice">
+Its important to note the rdap-spec file must be mounted into the container as
+a file and not a directory.
+</aside>
+
+### Accessing the return code of the container
+
+The bellow command can be used to access the return code for the container.
+
+```
+docker wait rdap-conformance
+```
 
 License
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