Add workflow

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: macOS-latest
+    strategy:
+      matrix:
+        env:
+          - sdk: iphonesimulator11.4
+            destination: platform=iOS Simulator,name=iPhone 8,OS=11.4
+            xcode: /Applications/Xcode_9.4.1.app
+
+          - sdk: iphonesimulator12.4
+            destination: platform=iOS Simulator,name=iPhone 8,OS=12.4
+            xcode: /Applications/Xcode_10.3.app
+
+          - sdk: iphonesimulator13.0
+            destination: platform=iOS Simulator,name=iPhone 8,OS=13.0
+            xcode: /Applications/Xcode_11.app
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Select Xcode
+      run: sudo xcode-select -s ${{ matrix.env.xcode }}
+
+    - name: Build and Test
+      run: |
+        set -o pipefail && xcodebuild clean build test \
+          -project "$PROJECT" \
+          -scheme "$SCHEME" \
+          -sdk "$SDK" \
+          -destination "$DESTINATION" \
+          -configuration Debug \
+          -enableCodeCoverage YES \
+          CODE_SIGN_IDENTITY="" CODE_SIGNING_REQUIRED=NO | xcpretty -c;
+      env:
+        PROJECT: UITextView+Placeholder.xcodeproj
+        SCHEME: UITextView+Placeholder
+        SDK: ${{ matrix.env.sdk }}
+        DESTINATION: ${{ matrix.env.destination }}