setup workspace with CI and gitignore

.github/workflows/ci.yml

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+name: test suite
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+
+  cargo-fmt:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get latest version of stable rust
+      run: rustup update stable
+    - name: Check formatting with cargofmt
+      run: cargo fmt --all -- --check
+
+  clippy:
+    name: clippy
+    runs-on: ubuntu-latest
+    needs: cargo-fmt
+    steps:
+    - uses: actions/checkout@v1
+    - name: Get latest version of stable Rust
+      run: rustup update stable
+    - name: Lint code for quality and style with Clippy
+      run: cargo clippy --workspace --tests -- -D warnings
+    - name: Certify Cargo.lock freshness
+      run: git diff --exit-code Cargo.lock

.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "smoke"
+version = "0.1.0"

Cargo.toml

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+[workspace]
+
+members = [
+    "smoke",
+]

smoke/Cargo.toml

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

smoke/src/main.rs

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