D18082: kate/README: add a minimal list of build dependencies

[gregormi]

gregormi added a reviewer: Kate.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D18082

To: gregormi, #kate
Cc: kwrite-devel, hase, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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