DLCQuest : implement new game (#1628)

adding DLC Quest as a new game

worlds/dlcquest/docs/en_DLCQuest.md

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+# DLC Quest
+
+## Where is the settings page?
+
+The [player settings page for this game](../player-settings) contains all the options you need to configure and export a
+config file.
+
+## What does randomization do to this game?
+
+DLCs are obtained as checks for the multiworld. There are also some other optional checks in DLC Quest
+
+
+## What is the goal of DLC Quest?
+
+DLC Quest has two campaigns, and the player can choose which one they will play for their slot.
+They can also choose to do both campaigns.
+
+
+## What are location checks in DLC Quest?
+
+Location checks in DLC Quest always include:
+- DLC Purchases from the shopkeeper
+- Awardment-related objectives
+  - Killing Sheep in DLC Quest
+  - Specific Awardment objectives in Live Freemium or Die
+
+There also are a number of location checks that are optional, and individual players choose to include them or not in their shuffling:
+- Items that your character can obtain in various ways
+  - Swords
+  - Gun
+  - Box of Various Supplies
+  - Humble Indie Bindle
+  - Pickaxe
+- Coinsanity: Coins, either individually or as custom-sized bundles
+
+
+## Which items can be in another player's world?
+
+Every DLC in the game is shuffled in the item pool. The items related to the optional checks described above are also in the pool
+
+There are also some brand new trap items, used as filler, based on vanilla game annoyances
+- Zombie Sheep
+- Loading Screens
+- Temporary Spikes
+
+## When the player receives an item, what happens?
+
+Every time an item is received while online, a notification appears on screen informing the player of it.
+Some items also include an animation or cutscene that will play immediately upon receiving it.
+
+Items that are received while offline will not play any animation or cutscene, and simply be active when logging in.