✅ Add unit testing

.github/workflows/main.yml

@@ -0,0 +1,19 @@
+name: Hermes CI
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Swift
+      uses: fwal/setup-swift@v1
+    - name: Build
+      run: swift build
+    - name: Run tests
+      run: swift test