chore: Add contact note model (#2462)

spec/models/note_spec.rb

@@ -0,0 +1,23 @@
+require 'rails_helper'
+
+RSpec.describe Note, type: :model do
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:content) }
+    it { is_expected.to validate_presence_of(:account_id) }
+    it { is_expected.to validate_presence_of(:user_id) }
+    it { is_expected.to validate_presence_of(:contact_id) }
+  end
+
+  describe 'associations' do
+    it { is_expected.to belong_to(:account) }
+    it { is_expected.to belong_to(:user) }
+    it { is_expected.to belong_to(:contact) }
+  end
+
+  describe 'validates_factory' do
+    it 'creates valid note object' do
+      note = create(:note)
+      expect(note.content).to eq 'Hey welcome to chatwoot'
+    end
+  end
+end