D19804: Updated README.md with detailed build instructions

[David Rosca]

drosca accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R875 Falkon

REVISION DETAIL
  https://phabricator.kde.org/D19804

To: saishm, #falkon, drosca
Cc: SGOrava, ognarb, falkon, saishm, anmolgautam, iodelay, spoorun, ptabis, navarromorales, clivej, mparillo, ach
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