Add Github actions (#274)

.github/workflows/main.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
+    steps:
+    - uses: actions/checkout@v1
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        profile: minimal
+        override: true
+        components: rustfmt, clippy
+    - uses: actions-rs/cargo@v1.0.1
+      name: Check format
+      with:
+        command: fmt
+        args: --all -- --check
+    - uses: actions-rs/cargo@v1.0.1
+      name: Run clippy
+      with:
+        command: clippy
+        args: --all-targets -- -D warnings
+    - uses: actions-rs/cargo@v1.0.1
+      name: Run clippy (All features)
+      with:
+        command: clippy
+        args: --all-targets --all-features -- -D warnings
+    - uses: actions-rs/cargo@v1.0.1
+      name: Run tests
+      with:
+        command: test
+