licenses: Add licenses subdirectory

Code licensing will be specified with SPDX license headers.
Documentation will be licensed under CC-by-SA.

Include the common license text files to reference with the headers.

Licenses are extracted from the following locations:
  https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
  https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
  https://creativecommons.org/licenses/by-sa/4.0/legalcode.txt

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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