feat(ash): added accounts, user for authentication

lib/accounts/user.ex

@@ -0,0 +1,26 @@
+defmodule Mv.Accounts.User do
+  use Ash.Resource,
+    domain: Mv.Accounts,
+    data_layer: AshPostgres.DataLayer
+
+  postgres do
+    table("users")
+    repo(Mv.Repo)
+  end
+
+  attributes do
+    uuid_primary_key(:id)
+
+    attribute(:email, :string, allow_nil?: true, public?: true)
+    attribute(:password_hash, :string, sensitive?: true)
+    attribute(:oicd_id, :string)
+  end
+
+  actions do
+    defaults([:read, :destroy, :create, :update])
+  end
+
+  relationships do
+    belongs_to(:member, Mv.Membership.Member)
+  end
+end