added readme

README.md

+# MyLittleZombie
+
+A small example of sprite animation. Tested under linux (arch) and win10.
+
+## Prerequisites
+
+- Rust toolchain with nightly (for faster builds)
+
+## Usage
+
+> cargo run --release
+
+## Assets
+
+- [bevy](https://www.bevy.com/)
+- [Zombie sprite sheet](https://www.kenney.nl/assets/toon-characters-1)
+
+## License
+
+TBD
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