Undertale for AP (#439)

Randomizes the items, and adds a new item to the pool, "Plot" which lets you go further and further in the game the more you have.

Developers: WirTheAvali (Preferred name for professional use, mewlif)

worlds/undertale/docs/en_Undertale.md

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+# Undertale
+
+## 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 is considered a location check in Undertale?
+
+Location checks in Undertale are all the spots in the game where you can get an item. Exceptions are Dog Residue, 
+the Nicecream bought in Hotland, and anything you cannot get in your chosen route.
+
+## When the player receives an item, what happens?
+
+When the player receives an item in Undertale, it will go into their inventory if they have space, otherwise it will 
+wait until they do have space. That includes items that don't appear in your inventory.
+
+## What is the victory condition?
+
+Victory is achieved when the player completes their chosen route. If they chose `all_routes` then they need to complete 
+every major route in the game, those being `Pacifist`, `Neutral`, and `Genocide`.

worlds/undertale/docs/undertale_en.md

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+# Undertale Randomizer Setup Guide
+
+### Required Software
+
+- Undertale from the [Steam page](https://store.steampowered.com/app/391540)
+- Archipelago from the [Archipelago Releases Page](https://github.com/ArchipelagoMW/Archipelago/releases)
+    - (select `Undertale Client` during installation.)
+
+### First time setup
+
+Start the Undertale client, and in the bottom text box, input `/auto_patch (Input your Undertale install directory here)` (It is usually located at `C:\Program Files\Steam\steamapps\Undertale`, but it can be different, you can more easily find the directory
+by opening the Undertale directory through Steam), it will then make an Undertale folder that will be created in the
+Archipelago install location. That contains the version of Undertale you will use for Archipelago. (You will need to
+redo this step when updating Archipelago.)
+
+### Connect to the MultiServer
+
+Make sure both Undertale and its client are running. (Undertale will ask for a saveslot, it can be 1 through 99, none 
+of the slots will overwrite your vanilla save, although you may want to make a backup just in case.)
+
+In the top text box of the client, type the 
+`Ip Address` (or `Hostname`) and `Port` separated with a `:` symbol. (Ex. `archipelago.gg:38281`)
+
+The client will then ask for the slot name, input that in the text box at the bottom of the client.
+
+### Play the game
+
+When the console tells you that you have joined the room, you're all set. Congratulations on successfully joining a
+multiworld game!
+
+### Where do I get a YAML file?
+
+You can customize your settings by visiting the [Undertale Player Settings Page](/games/Undertale/player-settings)