add rust reference implementation in package

Author: coyotte508

packages/blake3-wasm/.npmignore

@@ -0,0 +1 @@
+vendor

packages/blake3-wasm/vendor/Cargo.lock

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+[package]
+name = "blake3-example"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "reference_impl"
+path = "src/lib.rs"
+
+[[bin]]
+name = "blake3-example"
+path = "src/main.rs" 

packages/blake3-wasm/vendor/Cargo.toml

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+# BLAKE3 Example
+
+This is a simple example that demonstrates using the BLAKE3 hash function with empty input.
+
+## Prerequisites
+
+- Rust and Cargo installed on your system. You can install them from [rustup.rs](https://rustup.rs/)
+
+## Running the Example
+
+1. Open a terminal in this directory
+2. Run the following command:
+   ```bash
+   cargo run
+   ```
+
+The program will output a 32-byte hash in hexadecimal format. For empty input, the expected output should be:
+```
+af1349b9f5f9a1a6a0404dea36dcc9499bcb25c9adc112b7cc9a93cae41f3262
+```
+
+## What the Code Does
+
+1. Creates a new BLAKE3 hasher
+2. Updates it with empty input
+3. Finalizes the hash into a 32-byte buffer
+4. Prints the hash in hexadecimal format