[S] Change in flashrom[master]: README: Add information about meson and link build instructions

[Angel Pons (Code Review)]

Attention is currently required from: Anastasia Klimchuk.

Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/70176 )

Change subject: README: Add information about meson and link build instructions
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Patch Set 1: Code-Review+1

(3 comments)

File README:

https://review.coreboot.org/c/flashrom/+/70176/comment/dd049a5a_abf895d5 
PS1, Line 49: Flashrom
nit: `flashrom` should not capitalised. if the idea of starting a sentence without capitalising the first letter of the first word is too painful, we can easily work around this problem with a slight rephrasing:
> It is possible to build flashrom using make or meson.

https://review.coreboot.org/c/flashrom/+/70176/comment/5159b67d_82b2cea9 
PS1, Line 51: although not exactly
            : all of them. Full meson support is on the roadmap in the nearest future.
Hmmm, if meson support isn't full-featured yet, should we explicitly suggest using make whenever possible, at least for now? We've had issues with distro packagers building flashrom v1.2 with meson: there were some bugs that resulted in the version string remaining empty (so logs wouldn't contain the flashrom version anymore) and the `-o` option not working (because of standalone mode, see CB:42230 for the fix).

We're aware of the OBSWG (One Build System Working Group) and the long-term plan to drop make in favor of meson. We would then update the README accordingly.

https://review.coreboot.org/c/flashrom/+/70176/comment/3cb71a13_b2f0c58f 
PS1, Line 54: /Documentation/building.md
Should we convert the README into a README.md and turn this into a link? Doesn't have to be done in this patch.