Set up GitHub Actions (#30)

* Create swift.yml

* Update swift.yml

Author: alexaubry

.github/workflows/swift.yml

@@ -0,0 +1,18 @@
+name: Swift Package
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v