[S] Change in flashrom[master]: README: Add installing and packaging instructions for meson

[Peter Marheine (Code Review)]

Attention is currently required from: Thomas Heijligen, Anastasia Klimchuk.

Peter Marheine has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/75125 )

Change subject: README: Add installing and packaging instructions for meson
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Patch Set 1:

(1 comment)

File README.rst:

https://review.coreboot.org/c/flashrom/+/75125/comment/be6f83de_113ccdf1 
PS1, Line 171: 	meson install -C <your_build_dir>
There's already a copy of this in building_from_source.rst: which one should we keep?

I'm inclined to put all of the meson documentation in the other file, and eventually the makefile docs will be deleted from here so all the build/install/package docs would then live outside the root-level README.

A very short "quickstart" sort of thing of commands that can be copied/pasted without any thought might be reasonable here, though; essentially copy the TL;DR section from the other doc.

```
To build and install flashrom using meson:

meson setup builddir
    meson compile -C builddir
    meson install -C builddir

For more details, refer to :doc:`dev_guide/building_from_source`.
```