add insert code example

Example 1: insert into

INSERT INTO client (prenom, nom, ville, age)
 VALUES
 ('Rébecca', 'Armand', 'Saint-Didier-des-Bois', 24),
 ('Aimée', 'Hebert', 'Marigny-le-Châtel', 36),
 ('Marielle', 'Ribeiro', 'Maillères', 27),
 ('Hilaire', 'Savary', 'Conie-Molitard', 58);

Example 2: insert into

INSERT INTO Customers (CustomerName, City, Country)

VALUES ('Cardinal', 'Stavanger', 'Norway');