rathi27akashHi rathi27akash,
Yes, VMware plans to introduce a Certification program for plug-in. For more details you can contact plugin@vmware.com.
I encourage you to go through the Best Practices for Developing Extensions for the vSphere Web Client available from latest version of SDK documentation:
http://pubs.vmware.com/vsphere-60/topic/com.vmware.ICbase/PDF/web_client_sdk_602_pg.pdf
As the name says, this section contains practices we recommend and can be used as a quality check for the plug-in your team develops.
Best Regards,
Ina