Dependencies missing from the README.md

[w8jcik]

It is not clear from the instructions what is needed to build this package.

I figured out that this is needed on Ubuntu, but not sure if this is all

sudo apt install libglib2.0-dev libddcutil-dev 

[digitaltrails]

The README.md does include the line:

The service is written in C. It has very few dependencies (glib and libddcutil) and is
consequently quite easy to build.

Plus the spec file is quite explicit about what is required.

But to be clearer, I will list them in a section and correct glib to glib-2. I consider it up to the person distributing or building to figure out how that translates to exact distro-specific dependencies.

[digitaltrails]

Added more info on dependencies.