Add readme

README.md

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+This is [AOSP Launcher3](https://android.googlesource.com/platform/packages/apps/Launcher3/) with minimal modifications to make it easier to build gradle or Android Studio against the Android SDK
+This is not interesting to end users, it is meant for testing and as a tool to report bugs in Android related to 3rd party launchers
+
+Build with
+
+```
+git clone https://github.com/kevinslashslash/Launcher3_gradle_build.git
+cd Launcher3_gradle_build
+git submodule init
+git submodule update
+./gradlew assembleAopsWithoutQuickstepDebug
+```
+
+