Make Classroom + Chat Command Builder dependencies clear

[WebCoder49]

I git cloned CTW into my .minetest/games/ directory to install it, and when I ran Minetest had to install Ruben Wardy's Classroom and Chat Command Builder mods (through the Minetest UI). The game did not make this clear for a non-technical user, and instead emitted Lua errors saying the dependencies were not present.

You should probably either mention this as installation instructions in the README, or include the dependencies in some way. They are not automatically installed in Minetest 5.8.0.

[WebCoder49]

Also, the game defaulted to creating a flat world when the singlenode world looks more like what you want.

[rubenwardy]

You need to recursively clone the repository to get submodules. git clone --recursive

[WebCoder49]

You need to recursively clone the repository to get submodules. git clone --recursive

Thank you! That was a very quick response.