Hello @Waleed Ebrahiem
First create security group in Azure AD (For example AZ-Users)
Using SQL SERVER Management Studio connected to the Database and execute New Query.
CREATE USER [AZ-Users] FROM EXTERNAL PROVIDER
The group has been created in Azure SQL Database
To give read-only permissions to the group AZ-Users execute query
EXEC sp_addrolemember 'db_datareader', 'AZ-Users'
https://learn.microsoft.com/en-us/azure/sql-database/sql-database-aad-authentication-configure?tabs=azure-powershell#create-contained-database-users-in-your-database-mapped-to-azure-ad-identities
https://learn.microsoft.com/en-us/azure/sql-database/sql-database-manage-logins