add emails for newsletter

app/admin/emails.rb

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+ActiveAdmin.register Email do
+    csv do
+      column :email
+      # preserve case
+    end
+    # See permitted parameters documentation:
+    # https://github.com/activeadmin/activeadmin/blob/master/docs/2-resource-customization.md#setting-up-strong-parameters
+    #
+    # Uncomment all parameters which should be permitted for assignment
+    #
+    permit_params :email
+    #
+    # or
+    #
+    # permit_params do
+    #   permitted = [:title, :description, :email, :phone]
+    #   permitted << :other if params[:action] == 'create' && current_user.admin?
+    #   permitted
+    # end
+    
+  end
+  

app/assets/stylesheets/email.scss

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+// Place all the styles related to the email controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: https://sass-lang.com/

app/controllers/email_controller.rb

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+class EmailController < ApplicationController
+  skip_before_action :verify_authenticity_token
+  def index
+  end
+
+  def create
+    @email = Email.create(message_params)
+    render json: {}, status: :created
+  end
+
+  private
+  def message_params
+    params.permit(:email)
+  end
+end

app/helpers/email_helper.rb

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+module EmailHelper
+end

app/models/email.rb

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+class Email < ApplicationRecord
+end

app/views/email/index.html.erb

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+<h1>Email#index</h1>
+<p>Find me in app/views/email/index.html.erb</p>