First, you must know what SAML SSO is.
Read few toturials to understand what IDP and SP are.
Then, when you have a correct working IDP :
- enter configuration of Projeqtor SP in global Parameters (tab authentication)

- when all is done, click on button "Display the Metadata of SP" and copy the xml data you get
- enter the xml definition of Projeqtor SP in your IDP

Solved, Thank you very much admin

can you please share details of configuration with google? i configured but got error

403. That’s an error.

Error: app_not_configured_for_user

Service is not configured for this user.

I'm not sure it may work with Google.
SSO connection in PROJEQTOR uses SAML2 protocole.
I think Google uses Oauth2, not sure SAML2 is available.
But sure for both an interaction in Google is required to define the service provider (SP in SAML)

Google supported SAML2