README.md: summary Dockerfile with all necessary lines in one step

Until now, the description in 'README.md' to build the Dockerfile in
'README.md' had one item per line, thoroughly describing the reason behind
that line. But in many cases, the user is already familiar with Docker (or
has already read through the items) and just wants to have the Dockerfile
ready fast. In these cases, all those extra explanations are annoying.

With this commit, an item '0' has been added at the start of the item list
for summary. It only contains the necessary Dockerfile contents with no
extra explanation.

0 files changed, 0 insertions, 0 deletions