create a separate doc page for prereqs and link from
other parts of the doc.

add CCBY 4.0 to changed files

address gari's comment
address inconsistent comment about go version

Change-Id: I7b044b5d29250d905fba1243a0719ba32e3dc6e6
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>