Update README to get a development environment for metrics-web going
Attempting to set up a development environment for metrics-web is not easy.
There is a reference to Debian packages that don't appear to exist, for example I think r-cran-java should be r-cran-rjava maybe?
It would be good to have a knowledgable person go over the whole thing and double check it.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information