Add complete multiplayer system with real-time gameplay, challenge system, and 50x50 board option

node_modules/socket.io-adapter/Readme.md

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+
+# socket.io-adapter
+
+Default socket.io in-memory adapter class.
+
+Compatibility table:
+
+| Adapter version | Socket.IO server version |
+|-----------------| ------------------------ |
+| 1.x.x           | 1.x.x / 2.x.x            |
+| 2.x.x           | 3.x.x                    |
+
+## How to use
+
+This module is not intended for end-user usage, but can be used as an
+interface to inherit from other adapters you might want to build.
+
+As an example of an adapter that builds on top of this, please take a look
+at [socket.io-redis](https://github.com/learnboost/socket.io-redis).
+
+## License
+
+MIT