Creating a new project seems to require an (undocumented) step on Linux

[jbreckmckye]

This is a small issue and I was able to resolve it eventually - but it did seem to take some time to figure out.

I've just moved over from Windows to Linux (Ubuntu) and had a bit of trouble getting the CMake scripts to work. (It's not a tool I'm very familiar with)

When I ran cmake --preset default . I would get the output

$ cmake --preset default .

Preset CMake variables:
  CMAKE_BUILD_TYPE="Debug"
  PSN00BSDK_TARGET="mipsel-none-elf"
  PSN00BSDK_TC=""

CMake Error at CMakeLists.txt:14 (psn00bsdk_add_executable):
  Unknown CMake command "psn00bsdk_add_executable".

-- Configuring incomplete, errors occurred!

This was surprising because the library path environment variable was set up correctly:

$ echo $PSN00BSDK_LIBS
/opt/psn00bsdk/lib/libpsn00b

Turns out (?) I needed to run an extra step, which I actually found in the instructions for building the examples:

cmake -S . -B ./build -G "Ninja" -DCMAKE_TOOLCHAIN_FILE=/opt/psn00bsdk/lib/libpsn00b/cmake/sdk.cmake

I think this works because it adds a CMake cache entry CMAKE_TOOLCHAIN_FILE:FILEPATH="/cmake/sdk.cmake". Again, I'm not sure if it's 'supposed' to rely on this, I know next to nothing about CMake.

Weirdly this isn't strictly required on Windows. On Windows I have build scripts that delete the /build dir every time, but this caused issues on Linux.

tl;dr: the Installation.md may be missing a step