adding cosmos db emulator workflow

Author: stefanedwards

.github/workflows/cosmos_db_emulator.yml

@@ -0,0 +1,17 @@
+name: .NET test Cosmos extension with Cosmos DB Emulator
+on:
+    workflow_dispatch:
+jobs:
+  unit_tests:
+    name: Test Cosmos extension with Cosmos DB Emulator
+    runs-on: windows-latest
+    steps:
+      - name: Checkout (GitHub)
+        uses: actions/checkout@v4
+      - name: Start Azure Cosmos DB emulator
+        run: |
+          Write-Host "Launching Cosmos DB Emulator"
+          Import-Module "$env:ProgramFiles\Azure Cosmos DB Emulator\PSModules\Microsoft.Azure.CosmosDB.Emulator"
+          Start-CosmosDbEmulator
+      - name: Run .NET tests
+        run: dotnet test -graphBuild:True  .\Extensions\Cosmos\Cosmos.DataTransfer.CosmosExtension.UnitTests\