change readme

Author: kritma

README.md

@@ -1,6 +1,7 @@
 # Random Boot Animation
 1. Install via [Magisk](https://github.com/topjohnwu/Magisk)
-2. Put animations in ```/data/local/bootanimations/``` ([File Manager](https://github.com/zhanghai/MaterialFiles))
+2. Put [animations](https://android.googlesource.com/platform/frameworks/base/+/master/cmds/bootanimation/FORMAT.md) in ```/data/local/bootanimations/``` ([File Manager](https://github.com/zhanghai/MaterialFiles))
 3. reboot
 4. enjoy
 
+[gif/vid to bootanimation.zip](https://github.com/kritma/BootanimationGenerator)