meta-acer: add a500 machine configuration

 * meta-acer layer configuration
 * a500 machine configuration
 * README and COPYING files

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
 meta-acer: added patched A500 Android 3.1.10 kernel

 * kernel 3.1.10 recipe and corresponding defconfig
 * The chroot script only mounts /dev, /proc and /sys, and chroots to /dev/mmcblk1p2
 * The chroot image is a simple initrd image, nothing fancy.
 * The kernel cmdline is specified with CONFIG_CMDLINE in the recipe

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>