D22025: Improve README documentation

[Nathaniel Graham]

ngraham marked 2 inline comments as done.

REPOSITORY
  R318 Dolphin

BRANCH
  improve-README-documentation (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D22025

To: ngraham, #documentation, #dolphin, yurchor
Cc: yurchor, kfm-devel, fprice, fbampaloukas, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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