Heretic: implement new game (#2256)

worlds/heretic/docs/setup_en.md

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+# Heretic Randomizer Setup
+
+## Required Software
+
+- [Heretic (e.g. Steam version)](https://store.steampowered.com/app/2390/Heretic_Shadow_of_the_Serpent_Riders/)
+- [Archipelago Crispy DOOM](https://github.com/Daivuk/apdoom/releases) (Same download for DOOM 1993, DOOM II and Heretic)
+
+## Optional Software
+
+- [ArchipelagoTextClient](https://github.com/ArchipelagoMW/Archipelago/releases)
+
+## Installing APDoom
+1. Download [APDOOM.zip](https://github.com/Daivuk/apdoom/releases) and extract it.
+2. Copy HERETIC.WAD from your steam install into the extracted folder.
+   You can find the folder in steam by finding the game in your library,
+   right clicking it and choosing *Manage→Browse Local Files*.
+
+## Joining a MultiWorld Game
+
+1. Launch apdoom-launcher.exe
+2. Choose Heretic in the dropdown
+3. Enter the Archipelago server address, slot name, and password (if you have one)
+4. Press "Launch Game"
+5. Enjoy!
+
+To continue a game, follow the same connection steps.
+Connecting with a different seed won't erase your progress in other seeds.
+
+## Archipelago Text Client
+
+We recommend having Archipelago's Text Client open on the side to keep track of what items you receive and send.
+APDOOM has in-game messages,
+but they disappear quickly and there's no reasonable way to check your message history in-game.
+
+### Hinting
+
+To hint from in-game, use the chat (Default key: 'T'). Hinting from Heretic can be difficult because names are rather long and contain special characters. For example:
+```
+!hint The River of Fire (E2M3) - Green key
+```
+The game has a hint helper implemented, where you can simply type this:
+```
+!hint e2m3 green
+```
+For this to work, include the map short name (`E1M1`), followed by one of the keywords: `map`, `blue`, `yellow`, `green`.
+
+## Auto-Tracking
+
+APDOOM has a functional map tracker integrated into the level select screen.
+It tells you which levels you have unlocked, which keys you have for each level, which levels have been completed,
+and how many of the checks you have completed in each level.