Added codecov support in gitlab action file

Author: ljnath

.github/workflows/dotnet-CI-workflow.yml

@@ -32,3 +32,8 @@ jobs:
 
     - name: Run Tests
       run: vstest.console.exe .\RandomString4NetTest\bin\Release\RandomString4NetTest.dll
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v3
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}