Create Dockerfile and instructions for building using the docker image

DOCKER.md

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+Building from Docker
+--------
+
+Create the docker image
+```bash
+$ docker image build -t milewski-ctfp-pdf:1.0 .
+```
+
+Run it interactively starting the nix-shell
+```bash
+$ docker container run -i -t --name ctfp milewski-ctfp-pdf:1.0 nix-shell
+```
+
+Follow build directions in README.md
+
+Copy build artifact(s) to local filesystem
+```bash
+docker cp ctfp:/usr/git/milewski-ctfp-pdf/out/... destfile
+```

Dockerfile

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+FROM nixorg/nix:latest
+ENV NIX_PATH="nixpkgs=https://github.com/NixOS/nixpkgs/archive/release-19.03.tar.gz" 
+WORKDIR /usr/git
+RUN git clone https://github.com/hmemcpy/milewski-ctfp-pdf.git
+WORKDIR milewski-ctfp-pdf
+RUN nix-shell