ci: add GitHub Action to run tests (#15)

Author: hazzik

.github/workflows/dotnet.yml

@@ -0,0 +1,21 @@
+name: ci
+
+on: [push, pull_request]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Setup .NET
+      uses: actions/setup-dotnet@v3
+      with:
+        dotnet-version: 6.0.x
+    - name: Restore dependencies
+      run: dotnet restore src
+    - name: Build
+      run: dotnet build src --no-restore
+    - name: Test
+      run: dotnet test src --no-build -f net6.0