D25905: Add install instruction for development

[Carl Schwan]

ognarb added a reviewer: ltoscano.

REPOSITORY
  R184 Documentation Website (docs.kde.org)

REVISION DETAIL
  https://phabricator.kde.org/D25905

To: ognarb, ltoscano
Cc: kde-doc-english, gennad, fbampaloukas, skadinna
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