Set up GitHub Actions

.github/workflows/main.yml

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+on:
+  push:
+    branches: [ github-actions ]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - run: rustup component add clippy
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+    - name: Run clippy
+      uses: actions-rs/clippy-check@v1
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}
+        args: --all-features
+
+  windows:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - run: CALL "ci_extra\install_llvm.bat"
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
+
+  mac:
+    runs-on: macos-latest
+
+    steps:
+    - run: rustup component add rustfmt
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose

ci_extra/install_llvm.bat

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+@ECHO OFF
+
+curl -fsSL -o "LLVM-10.0.0-win64.exe" "https://github.com/llvm/llvm-project/releases/download/llvmorg-10.0.0/LLVM-10.0.0-win64.exe"
+LLVM-10.0.0-win64.exe /S