add sample rust project

.github/workflows/ci-rustfmt.yml

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+name: CI Rustfmt
+on: pull_request
+
+jobs:
+  format:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # v1.0.7
+        with:
+          toolchain: nightly
+          override: true
+          components: rustfmt
+      - uses: mbrobbel/rustfmt-check@master
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          mode: review

test_rs/.gitignore

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+/target

test_rs/Cargo.toml

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+[package]
+name = "test_rs"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

test_rs/src/main.rs

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+fn main()
+{
+    println!("Hello, world!");
+}