Terraria: Implement New Game (#1405)

Co-authored-by: Zach Parks <zach@alliware.com>
Co-authored-by: Fabian Dill <Berserker66@users.noreply.github.com>

worlds/terraria/docs/en_Terraria.md

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+# Terraria
+
+## 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?
+
+Boss/event flags are randomized. So, defeating Empress of Light could give you Post-Skeletron, which allows you to enter
+the Dungeon, for example. In your player settings, you may also add item rewards and achievements to the pool.
+
+## What Terraria items can appear in other players' worlds?
+
+Boss/event flags, and item rewards if enabled.
+
+## What does another world's item look like in Terraria?
+
+You won't see the items in Terraria, but you will receive a chat message, telling you what item you sent to whom.

worlds/terraria/docs/setup_en.md

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+# Terraria for Archipelago Setup Guide
+
+## Required Software
+
+Download and install [Terraria](https://store.steampowered.com/app/105600/Terraria/)
+and [TModLoader](https://store.steampowered.com/app/1281930/tModLoader/) on Steam
+
+## Installing the Archipelago Mod
+
+Subscribe to [the mod](https://steamcommunity.com/sharedfiles/filedetails/?id=2922217554) on Steam.
+
+This mod might not work with mods that significantly alter progression or vanilla features. It is
+highly recommended to use utility mods and features to speed up gameplay, such as:
+
+- Journey Mode
+- Ore Excavator
+- Magic Storage
+- Alchemist NPC Lite
+- Reduced Grinding
+
+## Configuring your YAML File
+
+### What is a YAML and why do I need one?
+
+You can see the [basic multiworld setup guide](/tutorial/Archipelago/setup/en) here
+on the Archipelago website to learn about why Archipelago uses YAML files and what they're for.
+
+### Where do I get a YAML?
+
+You can use the [game settings page for Terraria](/games/Terraria/player-settings) here
+on the Archipelago website to generate a YAML using a graphical interface.
+
+## Joining an Archipelago Game in Terraria
+
+1. Launch TModLoader
+2. In Workshop > Manage Mods, edit Archipelago Randomizer's settings
+    - "Name" should be the player name you set when creating your YAML file
+    - "Port" should be the port number associated with the Archipelago server. It will be a 4 or 5
+    digit number.
+    - If you're not hosting your game on the Archipelago website, change "Address" to the server's
+    URL or IP address
+3. Create a new character and world as normal (or use an existing one if you prefer). Terraria is
+usually significantly more difficult with this mod, so it is recommended to choose a lower
+difficulty than you normally would.
+4. Open the world in single player or multiplayer
+5. When you're ready, open chat, and enter `/apstart` to start the game.
+   
+## Commands
+
+While playing Archipelago, you can interact with the server using the commands listed in the
+[commands guide](/tutorial/Archipelago/commands/en). To send a command, open chat, and enter `/ap`,
+followed by the command you want to send. For example, `/ap !help`.