Documentation: Add lesson1 from the wiki

Convert the lesson1 document from the wiki to markdown, update it
for Ubuntu 18.04, and extend it slightly with new information.

Change-Id: Ieab60148f8bdd340e4c4c4c1dd7b6ed18fbd6ed7
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/26387
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Tested-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

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