Sorry, I misunderstood what you wanted.
SQL Server doesn't support read only views the same way the Oracle does. In fact, it is much more complex to create a read only view in SQL Server.
The simplest way to change a view to prevent it from being updatable is to artificially mangle one of the key columns from the underlying table. For example:
CASE WHEN CustomerID IS NULL THEN NULL ELSE CustomerID END AS CustomerID
, CompanyName, ContactName, Phone
The view looks and feels normal in every way, except it can't be updated because the key column is an expression.