basic admin endgame view and add (#3)

Reviewed-on: #3

lib/chesstrainer/endgames/tablebase/cache.ex

@@ -0,0 +1,17 @@
+defmodule Chesstrainer.Endgames.Tablebase.Cache do
+  @moduledoc """
+  A cache of tablebases by FEN.
+  """
+
+  alias Chesstrainer.Cache
+
+  @table :tablebase
+
+  def put(fen, tablebase), do: Cache.put(@table, fen, tablebase)
+
+  def get(fen), do: Cache.get(@table, fen)
+
+  def delete(fen), do: Cache.delete(@table, fen)
+  def show, do: Cache.show(@table)
+  def size, do: Cache.size(@table)
+end