Update README.md with Docker build instructions

README.md

@@ -1,7 +1,35 @@
 This is a playground for a new VyOS documentation starting for VyOS 1.2 (Crux)
 release.
 
+# Build
+
+## Native
+
 To build the manual run the following commands inside the `docs` folder:
 
 * `make html` for a HTML manual
 * `make latexpdf` for a LaTeX rendered PDF
+
+Required Debian Packages:
+* `python-sphinx`
+* `python-sphinx-rtd-theme`
+* `latexmk`
+* `texlive-latex-recommended`
+* `texlive-fonts-recommended`
+* `texlive-latex-extra`
+
+## Docker
+
+## Create Container
+
+```bash
+$ docker build -t vyos-docu - < Dockerfile
+```
+
+### Build Documentation
+
+```bash
+$ docker run -v `pwd`:`pwd` -w `pwd`/docs -i -t --rm vyos-docu bash
+```
+
+Inside the container you can the build the documentation as stated above