feat: Business hours

Data models and APIs for business hours

ref: #234

spec/models/concerns/out_of_offisable_spec.rb

@@ -0,0 +1,19 @@
+require 'rails_helper'
+
+shared_examples_for 'out_of_offisable' do
+  let(:obj) { create(described_class.to_s.underscore, working_hours_enabled: true, out_of_office_message: 'Message') }
+
+  it 'has after create callback' do
+    expect(obj.working_hours.count).to eq(7)
+  end
+
+  it 'is working on monday 10am' do
+    travel_to '26.10.2020 10:00'.to_datetime
+    expect(obj.working_now?).to be true
+  end
+
+  it 'is out of office on sunday 1pm' do
+    travel_to '01.11.2020 13:00'.to_datetime
+    expect(obj.out_of_office?).to be true
+  end
+end