add README

README.md

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+# 📐 norm
+
+[![Latest version]](https://crates.io/crates/norms)
+[![Docs badge]][docs]
+[![CI]](https://github.com/nomad/norm/actions)
+
+[Latest version]: https://img.shields.io/crates/v/norms.svg
+[Docs badge]: https://docs.rs/norms/badge.svg
+[CI]: https://github.com/nomad/norm/actions/workflows/ci.yml/badge.svg
+
+norm is ..
+
+## Example usage
+
+```rust
+```
+
+# A note on the crate's naming scheme
+
+norm's `package.name` is `norms`, while its `lib.name` is `norm`.
+This is because the package name has to be unique to be published to
+[crates.io], but unfortunately `norm` is already taken by a crate squatter.
+
+What this means is that you
+should import norm as `norms` in your `Cargo.toml`, and `use` it as
+`norm` in your source code.
+
+For example:
+
+```toml
+# Cargo.toml
+[dependencies]
+norms = { version = "0.1", features = ["fzf-v2"] }
+```
+
+```rust
+// main.rs
+use norm::fzf::FzfV2;
+
+fn main() {
+    println!("{:?}", FzfV2::new());
+}
+```
+
+[docs]: https://docs.rs/norms
+[crates.io]: https://crates.io