[M] Change in coreboot[master]: /: Update and rewrite README.md

[Martin L Roth (Code Review)]

Attention is currently required from: Felix Singer, Martin L Roth, Matt DeVillier, Martin Roth.

Hello Felix Singer, build bot (Jenkins), Matt DeVillier, Angel Pons, Elyes Haouas,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/67119

to look at the new patch set (#5).

Change subject: /: Update and rewrite README.md
......................................................................

/: Update and rewrite README.md

Update the top level readme file to reflect the updated documentation
and project status.

This is mostly a rewrite, but some text was just reformatted.

Signed-off-by: Martin Roth 
Change-Id: I2cd59d75da47b287029a9fc5eeddefaf99198965
---
M README.md
1 file changed, 166 insertions(+), 56 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/19/67119/5