Add README.md

Signed-off-by: Sora Morimoto <[email protected]>

README.md

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+# asdf-zig
+
+[Zig](https://ziglang.org) plugin for asdf version manager
+
+## Build History
+
+[![Build history](https://buildstats.info/github/chart/asdf-community/asdf-zig?branch=master)](https://github.com/asdf-community/asdf-zig/actions)
+
+## Installation
+
+```bash
+asdf plugin-add zig https://github.com/asdf-community/asdf-zig.git
+```
+
+## Usage
+
+Check [asdf](https://github.com/asdf-vm/asdf) readme for instructions on how to
+install & manage versions.
+
+## License
+
+Licensed under the
+[Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0).