[Rpm-maint] [rpm-software-management/rpm] test/README: Improve wording, convert to markdown (#1662)

[Florian Festi]

Looks like the new file does not get automatically picked up by automake and needs to be added to `EXTRA_DIST` in `tests/Makefile.am`.

Generally changes to the content (even if just rewording) and changing the format as a whole should be done in separate patches but it's not a big deal here. Feel free to keep as is.

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