Add Github Actions tests

.github/workflows/tests.yaml

@@ -0,0 +1,23 @@
+name: tests
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v2
+      with:
+        dotnet-version: 6.0.x
+
+    - name: Run Unit Tests
+      run: dotnet test src\hud-merger.sln