Enhance the documentation to include a note that brod requires CMake to build #645
Description
If CMake is not installed, mix deps.compile fails. Here is an example error from macOS:
(Mix) Could not compile dependency :crc32cer, "/Users//.mix/elixir/1-18-otp-28/rebar3 bare compile --paths /Users///_build/dev/lib/*/ebin" command failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile crc32cer --force", update it with "mix deps.update crc32cer" or clean it with "mix deps.clean crc32cer"
It would be helpful to mention the dependency on CMake, which comes from crc32cer, to help ease adoption of brod.