Make applying patches easier and better Readme

README.md

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+Read it first : https://github.com/android-rpi/local_manifests
+
+## Build Kernel
+
+ ```
+ Install gcc-arm-linux-gnueabihf
+ $ cd kernel/rpi
+ $ ARCH=arm scripts/kconfig/merge_config.sh arch/arm/configs/bcm2709_defconfig android/configs/android-base.cfg android/configs/android-recommended.cfg
+ $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make zImage
+ $ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make dtbs
+ ```
+
+## Install python mako module
+
+
+ `sudo apt-get install python-mako`
+
+## Patch framework source :
+
+https://github.com/android-rpi/device_brcm_rpi3/wiki#use-hal_pixel_format_bgra_8888
+
+## Build Android source
+
+  ```
+  Continue build with http://source.android.com/source/building.html
+  $ source build/envsetup.sh
+  $ lunch rpi3-eng
+  $ make ramdisk systemimage
+  ```
+
+## Help for build failure :
+   https://github.com/android-rpi/device_brcm_rpi3/wiki/Build-Errors
+
+## Prepare sd card
+
+ # Partitions of the card should be set-up like followings.
+
+ * p1 512MB for BOOT : Do fdisk : W95 FAT32(LBA) & Bootable, mkfs.vfat
+ * p2 512MB for /system : Do fdisk, new primary partition
+ * p3 512MB for /cache  : Do fdisk, mkfs.ext4
+ * p4 remainings for /data : Do fdisk, mkfs.ex4
+ * Set volume label for each partition - system, cache, userdata: use -L option of mkfs.ext4, e2label command, or -n option of mkfs.vfat
+
+## Write system partition
+
+  ```
+  $ cd out/target/product/rpi3
+  $ sudo dd if=system.img of=/dev/<p2> bs=1M
+  ```
+
+## Copy kernel & ramdisk to BOOT partition
+
+ * device/brcm/rpi3/boot/* to p1:/
+ * kernel/rpi/arch/arm/boot/zImage to p1:/
+ * kernel/rpi/arch/arm/boot/dts/bcm2710-rpi-3-b.dtb to p1:/
+ * kernel/rpi/arch/arm/boot/dts/overlays/vc4-kms-v3d.dtbo to p1:/overlays/vc4-kms-v3d.dtbo
+ * out/target/product/rpi3/ramdisk.img to p1:/
+
+## HDMI_MODE : If DVI monitor does not work, try followings for p1:/config.txt
+
+  ```
+  hdmi_group=2
+  hdmi_mode=85
+  ```
+
+## How to put Android-TV launcher :
+
+ * https://github.com/android-rpi/device_brcm_rpi3/wiki#how-to-apply-android-tv-leanback-launcher