Add .NET CI workflow for build and test automation

Introduced a GitHub Actions workflow (`build-and-test.yml`) to automate the build and test process for a .NET project.

Author: froghramar

.github/workflows/build-and-test.yml

@@ -0,0 +1,42 @@
+name: .NET CI
+
+on:
+  push:
+    branches: [ main ]
+  workflow_dispatch:
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '10.0.x'
+
+      - name: Cache NuGet packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.nuget/packages
+          key: ${{ runner.os }}-nuget-${{ hashFiles('**/*.csproj') }}
+          restore-keys: |
+            ${{ runner.os }}-nuget-
+
+      - name: Restore
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --configuration Release --no-restore
+
+      - name: Test
+        run: dotnet test --configuration Release --no-build --logger "trx;LogFileName=test_results.trx"
+
+      - name: Upload test results
+        uses: actions/upload-artifact@v4
+        with:
+          name: test-results
+          path: '**/TestResults/*.trx'