feat: add support for registering server pid

todo_list.ex

@@ -1,6 +1,12 @@
 defmodule TodoServer do
-  def start(entries \\ []) do
-    spawn(fn -> loop(TodoList.new(entries)) end)
+  def start(entries \\ [], options \\ []) do
+    pid = spawn(fn -> loop(TodoList.new(entries)) end)
+
+    if Keyword.get(options, :local) do
+      Process.register(pid, :todo_list)
+    end
+
+    pid
   end
 
   def from_list(todo_list) do
@@ -50,6 +56,10 @@ defmodule TodoServer do
     nil
   end
 
+  def add(entry) do
+    add(:todo_list, entry)
+  end
+
   def entries(pid, date) do
     send(pid, {:entries, self(), date})
 
@@ -61,15 +71,27 @@ defmodule TodoServer do
     end
   end
 
+  def entries(date) do
+    entries(:todo_list, date)
+  end
+
   def update(pid, id, update_fun) do
     send(pid, {:update, id, update_fun})
     nil
   end
 
+  def update(id, update_fun) do
+    update(:todo_list, id, update_fun)
+  end
+
   def delete(pid, id) do
     send(pid, {:delete, id})
     nil
   end
+
+  def delete(id) do
+    delete(:todo_list, id)
+  end
 end
 
 defmodule TodoList do