Add service for creating invites

app/mailers/notification_mailer.rb

@@ -17,4 +17,10 @@ class NotificationMailer < ApplicationMailer
     @subject = "New app connected to your storage"
     mail to: @user.email, subject: @subject
   end
+
+  def new_invitations_available
+    @user = params[:user]
+    @subject = "New invitations added to your account"
+    mail to: @user.email, subject: @subject
+  end
 end

app/services/create_invitations.rb

@@ -0,0 +1,17 @@
+class CreateInvitations < ApplicationService
+  def initialize(user:, amount:, notify: true)
+    @user = user
+    @amount = amount
+    @notify = notify
+  end
+
+  def call
+    @amount.times do
+      Invitation.create(user: @user)
+    end
+
+    if @notify
+      NotificationMailer.with(user: @user).new_invitations_available.deliver_later
+    end
+  end
+end

app/views/notification_mailer/new_invitations_available.text.erb

@@ -0,0 +1,11 @@
+Hi <%= @user.display_name.presence || @user.cn %>,
+
+New invitations have just been added to your Kosmos account, so you can invite more people to our cooperative services:
+
+<%= invitations_url %>
+
+Have a nice day!
+
+---
+
+Tip: if you want to invite someone you're meeting in person, log into your account panel on a mobile device and let people scan the invitation QR code from theirs.