D8937: cleanup litter in main dir

[Harald Sitter]

sitter created this revision.
sitter added a reviewer: sandsmark.
Restricted Application added a subscriber: kde-utils-devel.

REVISION SUMMARY
  - drop ChangeLog; not curated anymore
  - drop INSTALL; out of date and there is better documentation online for building kf5 software
  - NEWS; empty
  - README; drop outdated stuff and convert to markdown so it gets rendered in repo viewers and is easier on the eyes when viewed in plaintext
  
  (Leaving TODO behind even though it is not cureated it still has useful
   ideas for future reference)

REPOSITORY
  R352 Filelight

BRANCH
  no-litter

REVISION DETAIL
  https://phabricator.kde.org/D8937

AFFECTED FILES
  ChangeLog
  INSTALL
  NEWS
  README
  README.md

To: sitter, sandsmark
Cc: kde-utils-devel
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