Update README.md

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  1. README.md
  2. emmc_image.py
  3. emmc_image_unittest.py
README.md

emmc_image.py is a tool to generate an eMMC USER image.

Requirement:

Factory image downloaded from console in both slots:

./emmc_image.py --out emmc.zip --factory_files console_build.zip --all-slots

Custom images in slot A, factory image downloaded from console in slot B:

./emmc_image.py --out emmc.zip --factory_files console_build.zip \
--all-slots \
--partition boot_a custom_boot.img \
--partition system_a custom_system.img \
--partition vbmeta_a custom_vbmeta.img

Dump partition table:

parted emmc.img