GitHub Actions workflow added

Author: HasanJaved-Developer

.github/workflows/dotnet-tests.yml

@@ -0,0 +1,28 @@
+name: .NET Tests (collector)
+
+on:
+  push: { branches: [ "main" ] }
+  pull_request: { branches: [ "main" ] }
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '9.0.x'
+
+      - name: Restore
+        run: dotnet restore
+
+      - name: Test (collector, Cobertura)
+        run: |
+          # Centralize results in one folder (still creates GUID subfolders inside)
+          dotnet test --collect:"XPlat Code Coverage" --results-directory ./TestResults
+
+      - name: Upload coverage artifacts (Cobertura)
+        uses: actions/upload-artifact@v4
+        with:
+          name: cobertura-reports
+          path: '**/TestResults/**/coverage.cobertura.xml'