Create default workflow

.github/workflows/main.yml

@@ -0,0 +1,44 @@
+
+name: CI
+
+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: ['11.3', '11.4']
+    runs-on: macos-latest
+    env:
+      DEVELOPER_DIR: /Applications/Xcode_${{ matrix.xcode_version }}.app
+    steps:
+      - uses: actions/checkout@v2
+      - run: swift -version
+      - run: swift test --enable-code-coverage
+
+  Linux:
+    strategy:
+      matrix:
+        tag: ['5.1', '5.2']
+    runs-on: ubuntu-latest
+    container:
+      image: swift:${{ matrix.tag }}
+    steps:
+      - uses: actions/checkout@v2
+      - run: swift test --enable-test-discovery --enable-code-coverage
+      - uses: mattpolzin/swift-codecov-action@0.4.0