add new file

app/models/client.rb

@@ -0,0 +1,7 @@
+class Client < ApplicationRecord
+	validates :name, presence: { message: "Please enter  client name." }
+	validates :name,  :uniqueness => {:message =>"This client name is already taken." } ,on: :create
+	validates :email, presence: { message: "Please enter  client email." }  
+	validates :phone,  presence: { message: "Please enter client phone." } 
+	validates :address,  presence: { message: "Please enter  client address." } 
+end