Refactor and add securities controller

lib/tradex_web/controllers/security_html.ex

@@ -0,0 +1,13 @@
+defmodule TradexWeb.SecurityHTML do
+  use TradexWeb, :html
+
+  embed_templates "security_html/*"
+
+  @doc """
+  Renders a security form.
+  """
+  attr :changeset, Ecto.Changeset, required: true
+  attr :action, :string, required: true
+
+  def security_form(assigns)
+end