Add github workflow basic build yml (#166)

Author: carlossanlop

.github/workflows/dotnet.yml

@@ -0,0 +1,21 @@
+name: .NET
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: '8.0.x'
+    - name: Restore source-indexer.sln
+      run: dotnet restore src/source-indexer.sln
+    - name: Build source-indexer.sln
+      run: dotnet build --no-restore src/source-indexer.sln