#10 Add Swift CI workflow and update README with CI details

.github/workflows/swift-ci.yml

@@ -0,0 +1,36 @@
+name: Swift CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+concurrency:
+  group: swift-ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build-and-test:
+    name: Build and Test
+    runs-on: macos-15
+    timeout-minutes: 20
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Swift 6.3
+        uses: swift-actions/setup-swift@v3
+        with:
+          swift-version: '6.3'
+
+      - name: Show Swift version
+        run: swift --version
+
+      - name: Build package
+        run: swift build
+
+      - name: Run test suite
+        run: swift test

README.md

@@ -246,6 +246,12 @@ swift build
 swift test
 ```
 
+Continuous integration:
+
+- GitHub Actions runs the Swift CI workflow on pull requests, pushes to `main`, and manual dispatches.
+- The workflow currently uses a macOS runner, installs Swift 6.3, and runs `swift build` plus `swift test`.
+- If CI fails, reproduce the same checks locally from the repository root before opening or updating a pull request.
+
 ## Documentation
 
 - Software requirements specification: [docs/SRS.md](docs/SRS.md)