Add GitHub Actions workflow for Swift project

This workflow builds and tests a Swift project on pushes and pull requests to the main branch.

Author: keybuk

.github/workflows/swift.yml

@@ -0,0 +1,26 @@
+# This workflow will build a Swift project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-swift
+
+name: Swift
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup Swift environment
+      uses: swift-actions/setup-swift@v2
+      with:
+        swift-version: "6.2"
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v

README.md

@@ -1,2 +1,4 @@
 # FifthEdition
+![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/keybuk/FifthEdition/swift.yml)
+
 Swift support for 5eTools schema