docs: initial project README

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Ifce7143b8734868250a7665463ac344a6a6a6964

README.md

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+# beer
+
+A fast, software-rendered, **Wayland-native** terminal emulator written in Rust.
+Lightweight in dependencies, on disk, and in memory.
+
+## Build
+
+A Nix dev shell provides the toolchain and native libraries:
+
+```sh
+# Enter a devshell for necessary deps
+$ nix develop
+
+# Build in release mode
+cargo build --release
+```
+
+## License
+
+EUPL-1.2.