Add dialyzer dependency

Add typespecs to several functions

lib/matrix_server/schema/account.ex

@@ -7,6 +7,10 @@ defmodule MatrixServer.Account do
   alias MatrixServerWeb.Client.Request.{Register, Login}
   alias Ecto.Multi
 
+  @type t :: %__MODULE__{
+    password_hash: String.t()
+  }
+
   @max_mxid_length 255
 
   @primary_key {:localpart, :string, []}

lib/matrix_server/schema/room.ex

@@ -7,6 +7,12 @@ defmodule MatrixServer.Room do
   alias MatrixServer.{Repo, Room, Event, Alias, RoomServer}
   alias MatrixServerWeb.Client.Request.CreateRoom
 
+  @type t :: %__MODULE__{
+    visibility: :public | :private,
+    state: list(list(String.t())),
+    forward_extremities: list(String.t())
+  }
+
   @primary_key {:id, :string, []}
   schema "rooms" do
     field :visibility, Ecto.Enum, values: [:public, :private]