chore: generate a rustler project

Signed-off-by: SphericalKat <amolele@gmail.com>

native/ketbin_utils_syntax/.cargo/config

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+[target.x86_64-apple-darwin]
+rustflags = [
+    "-C", "link-arg=-undefined",
+    "-C", "link-arg=dynamic_lookup",
+]

native/ketbin_utils_syntax/.gitignore

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+/target

native/ketbin_utils_syntax/Cargo.toml

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+[package]
+name = "ketbin_utils_syntax"
+version = "0.1.0"
+authors = []
+edition = "2018"
+
+[lib]
+name = "ketbin_utils_syntax"
+path = "src/lib.rs"
+crate-type = ["cdylib"]
+
+[dependencies]
+rustler = "0.22.0"

native/ketbin_utils_syntax/README.md

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+# NIF for Elixir.Ketbin.Utils.Syntax
+
+## To build the NIF module:
+
+- Your NIF will now build along with your project.
+
+## To load the NIF:
+
+```elixir
+defmodule Ketbin.Utils.Syntax do
+    use Rustler, otp_app: :ketbin, crate: "ketbin_utils_syntax"
+
+    # When your NIF is loaded, it will override this function.
+    def add(_a, _b), do: :erlang.nif_error(:nif_not_loaded)
+end
+```
+
+## Examples
+
+[This](https://github.com/hansihe/NifIo) is a complete example of a NIF written in Rust.

native/ketbin_utils_syntax/src/lib.rs

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+#[rustler::nif]
+fn add(a: i64, b: i64) -> i64 {
+    a + b
+}
+
+rustler::init!("Elixir.Ketbin.Utils.Syntax", [add]);