Documentation/Build instructions

[pjh64]

Tried out the precompiled binaries of this project and they work so far. Since it doesn't support the CardKB I wanted to try out compiling the project. Unfortunately the README doesn't state much about building besides it being done with esp-idf 3.3-dirty.

The project lacks a CMakeLists.txt, so I was not able to use esp-idf as it is commonly instructed / explained.

Am I missing something here? Can anyone elaborate on how to build this project?

Thanks in advance and sry, if the solution is too obvious. :)