Add Admin Administrator route, controller and manage ability for admin users

app/controllers/admin/administrators_controller.rb

@@ -0,0 +1,32 @@
+class Admin::AdministratorsController < Admin::BaseController
+  load_and_authorize_resource
+
+  def index
+    @administrators = @administrators.page(params[:page])
+  end
+
+  def search
+    @user = User.find_by(email: params[:email])
+
+    respond_to do |format|
+      if @user
+        @administrator = Administrator.find_or_initialize_by(user: @user)
+        format.js
+      else
+        format.js { render "user_not_found" }
+      end
+    end
+  end
+
+  def create
+    @administrator.user_id = params[:user_id]
+    @administrator.save
+
+    redirect_to admin_administrators_path
+  end
+
+  def destroy
+    @administrator.destroy
+    redirect_to admin_administrators_path
+  end
+end