Users/tihuang/clientcertdoc (#1192)
Users/tihuang/clientcertdoc (#1192)

* Create clientcert.md
kasubram/vsts-agent,kasubram/vsts-agent,Microsoft/vsts-agent,Microsoft/vsts-agent,Microsoft/vsts-agent,kasubram/vsts-agent,Microsoft/vsts-agent,kasubram/vsts-agent