[Sudoku] Added new BK mode game (#910)

Co-authored-by: Hussein Farran <hmfarran@gmail.com>
Co-authored-by: SoldierofOrder <107806872+SoldierofOrder@users.noreply.github.com>

worlds/bk_sudoku/docs/en_Sudoku.md

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+# Bk Sudoku
+
+## What is this game?
+
+BK Sudoku is not a typical Archipelago game; instead, it is a generic Sudoku client that can connect to any existing multiworld. When connected, you can play Sudoku to unlock random hints for your game. While slow, it will give you something to do when you can't reach the checks in your game.
+
+## What hints are unlocked?
+
+After completing a Sudoku puzzle, the game will unlock 1 random hint for an unchecked location in the slot you are connected to. It is possible to hint the same location repeatedly if that location is still unchecked.
+
+## Where is the settings page?
+
+There is no settings page; this game cannot be used in your .yamls. Instead, the client can connect to any slot in a multiworld.

worlds/bk_sudoku/docs/setup_en.md

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+# BK Sudoku Setup Guide
+
+## Required Software
+- [Bk Sudoku](https://github.com/Jarno458/sudoku)
+- [.Net 6](https://docs.microsoft.com/en-us/dotnet/core/install/windows?tabs=net60)
+
+## General Concept
+
+This is a client that can connect to any multiworld slot, and lets you play Sudoku to unlock random hints for that slot's locations.
+
+Due to the fact that the Sudoku client may connect to any slot, it is not necessary to generate a YAML for this game as it does not generate any new slots in the multiworld session.
+
+## Installation Procedures
+
+Go to the latest release on [BK Sudoku Releases](https://github.com/Jarno458/sudoku/releases). Download and extract the `Bk_Sudoku.zip` file.
+
+## Joining a MultiWorld Game
+
+1. Run Bk_Sudoku.exe
+2. Enter the name of the slot you wish to connect to
+3. Enter the server url & port number
+4. Press connect
+5. Choose difficulty
+6. Try to solve the Sudoku