Add the Link model.

lib/link_shortener/link.ex

@@ -0,0 +1,18 @@
+defmodule LinkShortener.Link do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "links" do
+    field :name, :string
+    field :url, :string
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(link, attrs) do
+    link
+    |> cast(attrs, [:name, :url])
+    |> validate_required([:name, :url])
+  end
+end