Add github workflow

.github/workflows/build.yml

@@ -0,0 +1,15 @@
+name: Build and Test
+
+on:
+  push:
+    branches:
+      - main
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Build and Test
+        run: dotnet test