Generate metadata controller

This metadata controller is expected to serve as a tool for inspecting
single metadata records and later also multiple records in comparison
with each other.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Implement simplistic metadata viewer

I have added code to display random metadata records. This is done by
converting the record JSON to a string. The string is inserted into the
HTML element pre.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Update README

Just added some statements explaining how to get the application
running.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>