Lets try some CI

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        rust: [stable, nightly]
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        id: toolchain
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+          components: rustfmt, clippy
+
+      - name: clippy
+        if: matrix.os == 'ubuntu-latest' && matrix.rust == 'stable'
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings