feat: add some irc codes

lib/sunbeam/irc/codes.ex

@@ -1,5 +1,15 @@
 defmodule Sunbeam.Irc.Codes do
   @rpl_welcome "001"
+  @rpl_yourhost "002"
+  @rpl_created "003"
+  @rpl_myinfo "004"
+  @rpl_isupport "005"
+  @rpl_bounce "010"
 
   def rpl_welcome(), do: @rpl_welcome
+  def rpl_yourhost(), do: @rpl_yourhost
+  def rpl_created(), do: @rpl_created
+  def rpl_myinfo(), do: @rpl_myinfo
+  def rpl_isupport(), do: @rpl_isupport
+  def rpl_bounce(), do: @rpl_bounce
 end