Add first step of creating an Article

lib/outlook/articles/raw_html_input.ex

@@ -0,0 +1,16 @@
+defmodule Outlook.Articles.RawHtmlInput do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  embedded_schema do
+    field :content, :string
+  end
+
+  @doc false
+  def changeset(html_input, attrs) do
+    html_input
+    |> cast(attrs, [:content])
+    |> validate_required([:content])
+    |> validate_length(:content, min: 200)
+  end
+end