Login to Odoo as the Administrator
Go to Apps > Apps clear App filter & Search for oauth module You will see OAuth2 Authentication Module Install it.
Now go to Setting > General Setting > Authentication tab Click on Allow user to sign in with google option & Click on Google APIs console.
On Google API Console on browse left side in Development Console selection box Create Project.
In Project Name enter whatever you want, e.g. OdooERP & Click on Create button.
After creating project in left side menu bar click on Credentials menu to Create new Client ID.
Under Authorized JavaScript origins enter your server domain name, e.g.http://odoo.mydomain.com
Under Authorized redirect URL enter you domain plus the OAUTH path,
e.g. http://odoo.mydomain.com/auth_oauth/signin
New popup will open with your OAuth Client ID & Client Secret.
Now copy paste your Client ID in Odoo browser.
Click on Apply Button you will able to login with in Odoo with your Gmail account.
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