Feature: Access tokens for API access (#604)

Co-authored-by: Pranav Raj Sreepuram <pranavrajs@gmail.com>

app/models/concerns/access_tokenable.rb

@@ -0,0 +1,11 @@
+module AccessTokenable
+  extend ActiveSupport::Concern
+  included do
+    has_one :access_token, as: :owner, dependent: :destroy
+    after_create :create_access_token
+  end
+
+  def create_access_token
+    AccessToken.create!(owner: self)
+  end
+end