Convert Docker documentation in MarkDown

ReadmeDocker.md

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+In order to build MAL/C with [Docker](http://docker.com) you have to create a docker image using one of the 2 provided
+configuration files: CentOSDockerfile or OpenSuseDockerfile.
+These images will contain the requirements to build MAL/C.
+Then, the freshly built image can be used to build (local) MAL/C.
+
+For example to build an OpenSuse instance of MAL/C:
+
+1. Creates the docker image
+
+        docker build -t malc-centos -f CentOSDockerfile .
+
+2. Creates and launches a emporary docker container to build current project
+
+        docker run --rm -u `id -u`:`id -g` -v $PWD:$PWD -w $PWD malc-centos ./genmakeall
+
+If you are behind a corporate proxy, think of using the build-args:
+
+    docker build \
+      --build-arg http_proxy=http://proxy.example.com:3128 --build-arg https_proxy=http://proxy.example.com:3128 \
+      -t malc-centos -f CentOSDockerfile .