add final jumpstart card pool and additional comments on JumpstartPoolGenerator

Mage/src/main/java/mage/game/jumpstart/JumpstartPoolGenerator.java

@@ -81,6 +81,19 @@ public class JumpstartPoolGenerator {
     }
   }
 
+  /* Notes
+   *
+   * 1) the pools generated by this method are for how the prerelease will be played (see https://mtg.gamepedia.com/Jumpstart#Events)
+   *    In order to support the 4 pack version, xmage would need to support editing multiple decks and some Duo format
+   *    similar to https://mtg.gamepedia.com/Duo_Standard
+   *
+   * 2) this treats all packs to have similar chance to open (packs will actually be opened at a particular rarity). This
+   *    could be implemented if you know the various ratios between packs by knowing the rarities from this source:
+   *    https://mtg.gamepedia.com/Jumpstart#Themes_and_mechanics
+   *
+   * 3) this does not attempt to add an additional rare 1/3 of the time as described here:
+   *    https://mtg.gamepedia.com/Jumpstart#Marketing
+   */
   public static Set<Card> generatePool() {
     try {
       DeckCardLists list = new DeckCardLists();