feat: Set up continuous integration

.github/workflows/main.yml

@@ -0,0 +1,19 @@
+name: Build and Test
+on:
+  push:
+    branches: *
+  pull_request:
+    branches: *
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '7.0.x'
+      - name: Build
+        run: dotnet build --configuration Release
+      - name: Test
+        run: dotnet test --configuration Release --no-build