Add build action (#3)

.github/workflows/swift.yml

@@ -0,0 +1,32 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  SwiftLint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: GitHub Action for SwiftLint with --strict
+        uses: norio-nomura/action-swiftlint@3.1.0
+        with:
+          args: --strict
+  Xcode:
+    strategy:
+      matrix:
+        xcode_version: ['12.0']
+    runs-on: macos-latest
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode_version }}.app
+    steps:
+      - uses: actions/checkout@v2
+      - run: swift -version
+      - run: swift package clean
+      - run: swift test -v --enable-code-coverage