Add RoR2 Docs

WebHostLib/static/assets/tutorial/ror2/setup_en.md

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+# Risk of Rain 2 Setup Guide
+
+## Install using r2modman
+### Install r2modman
+Head on over to the r2modman page on Thunderstore and follow the installation instructions.
+
+https://thunderstore.io/package/ebkr/r2modman/
+
+### Install Archipelago Mod using r2modman
+You can install the Archipelago mod using r2modman in one of two ways. 
+One, you can use the Thunderstore website and click on the "Install with Mod Manager" link.
+
+https://thunderstore.io/package/ArchipelagoMW/Archipelago/
+
+You can also search for the "Archipelago" mod in the r2modman interface.
+The mod manager should automatically install all necessary dependencies as well.
+
+### Running the Modded Game
+Click on the "Start modded" button in the top left in r2modman to start the game with the
+Archipelago mod installed.
+
+## Joining an Archipelago Session
+There will be a menu button on the right side of the screen in the character select menu. 
+Click it in order to bring up the in lobby mod config. 
+From here you can expand the Archipelago sections and fill in the relevant info.
+Keep password blank if there is no password on the server.
+
+Simply check `Enable Archipelago?` and when you start the run it will automatically connect.