add models for Project, Task, Note, Category

app/models/contact.rb

@@ -0,0 +1,7 @@
+class Contact < ApplicationRecord
+  has_many :phone_numbers
+  belongs_to :user
+
+	validates :name, presence: true
+  validates :email, format: { with: URI::MailTo::EMAIL_REGEXP }, allow_blank: true
+end