Add Hollow Knight setup guide, game info, and to README

WebHostLib/static/assets/tutorial/Hollow Knight/setup_en.md

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+# Hollow Knight for Archipelago Setup Guide
+
+## Required Software
+* Download and unzip the Scarab Mod Manager from the [Scarab GitHub Releases page](https://github.com/fifty-six/Scarab/releases).
+* A legal copy of Hollow Knight, not purchased or played through XBox Game Pass.
+    * Unfortunately, the Game Pass version is not currently compatible with mods.
+
+## Installing the Archipelago Mod using Scarab
+1. Launch Scarab and ensure it locates your Hollow Knight installation directory.
+2. Click the "Install" checkbox near the "Archipelago" mod entry.
+3. Launch the game, you're all set!
+
+## 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 Hollow Knight](/games/Hollow%20Knight/player-settings) here on the Archipelago 
+website to generate a YAML using a graphical interface.
+
+### Joining an Archipelago Game in Hollow Knight
+1. Start the game after installing all necessary mods.
+2. Create a **new save game.**
+3. Select the **Archipelago** game mode from the mode selection screen.
+4. Enter the correct settings for your Archipelago server.
+5. Hit **Start** to begin the game. The game will stall for a few seconds while it does all item placements.
+6. The game will immediately drop you into the randomized game. 
+   * If you are waiting for a countdown then wait for it to lapse before hitting Start.
+   * Or hit Start then pause the game once you're in it.