Add README for system JSON configuration files

This commit adds documentation describing the structure and purpose of
system JSON configuration files. It documents FRUs, muxes, and common
interface

Add README for system JSON configuration files

This commit adds documentation describing the structure and purpose of
system JSON configuration files. It documents FRUs, muxes, and common
interfaces, and outlines action group lifecycle steps: setup,
finalization, and recovery . The README also documents supported action
phases and tags, extensibility constraints, and includes a sample JSON
for reference.

Change-Id: I7ffcb220d9963ce2f1160ffbc74e321f2ae32940
Signed-off-by: Chanchal Tiwari <chanchaltiwari70021@gmail.com>

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