Add CredScan for code analysis

[skip ci]

azure-pipelines.yml

@@ -24,3 +24,7 @@ steps:
     scanType: 'Register'
     verbosity: 'Verbose'
     alertWarningLevel: 'High'  
+
+- task: CredScan@2
+  inputs:
+    toolMajorVersion: 'V2'