CONTRIBUTING.md

• Templates, metaprogramming, SNIFAE, constexprs, etc. are love
  • Try constexpr before reaching for #define
• New C++ features are love
  • Especially if they're custom reimplementations of standard library stuff
• If it builds and printf in kmain() looks alright, ship it!
  • Tests are nice but whatever, can't run them without using GCC 9 as the system compiler anyway (yolo)