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README.md

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+### Device specific configuration to build AOSP Android 13 for Raspberry Pi 4.
+
+#### Wiki:
+
+- TODO
+
+#### Issues:
+
+- [Android](https://github.com/raspberry-vanilla/android_local_manifest/issues)
+- [Linux kernel](https://github.com/raspberry-vanilla/android_kernel_manifest/issues)
+
+### How to build:
+
+1. Establish [Android build environment](https://source.android.com/setup/initializing) and install [repo](https://source.android.com/docs/setup/develop#installing-repo).
+
+2. Install additional packages (TODO: possibly non-exhaustive):
+
+```
+sudo apt-get install bc coreutils dosfstools e2fsprogs fdisk kpartx mtools ninja-build
+sudo snap install meson
+pip3 install ply
+```
+
+3. Initialize repo:
+
+```
+repo init -u https://android.googlesource.com/platform/manifest -b android-13.0.0_r6
+curl --create-dirs -L -o .repo/local_manifests/manifest_brcm_rpi4.xml -O -L https://raw.githubusercontent.com/raspberry-vanilla/android_local_manifest/android-13.0/manifest_brcm_rpi4.xml
+```
+
+You can also reduce download size by creating a shallow clone and removing unneeded projects (optional):
+
+```
+repo init -u https://android.googlesource.com/platform/manifest -b android-13.0.0_r6 --depth=1
+curl --create-dirs -L -o .repo/local_manifests/remove_projects.xml -O -L https://raw.githubusercontent.com/raspberry-vanilla/android_local_manifest/android-13.0/remove_projects.xml
+```
+
+4. Sync source code:
+
+```
+repo sync
+```
+
+5. Compile:
+
+```
+. build/envsetup.sh
+lunch aosp_rpi4-userdebug
+make bootimage systemimage vendorimage -j$(nproc)
+```
+
+6. Make flashable image:
+
+```
+./rpi4-mkimg.sh
+```
+
+Also look into [Linux kernel build instructions](https://github.com/raspberry-vanilla/android_kernel_manifest/tree/android-13.0).