Add a note for macOS users to Contributing to Ransack to make it more friendly.

[satou-haruka-37]

As per Contributing to Ransack
I forked the repository and ran bundle install,
I got the following error

1 warning generated.
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: warning: ignoring duplicate libraries: '-lruby.3.2'.
'-lruby.3.2'.
ld: library 'zstd' not found
clang: error: linker command failed with exit code
1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

make failed, exit code 2

Therefore, I thought it would be better to add an annotation.

[kou]

It seems that the error message is reported for mysql2 gem not ransack gem.
Is brianmario/mysql2#1345 the same problem?

[scarroll32]

Should this be closed satou-haruka-37 ?

[satou-haruka-37]

Sorry for the late reply.
I am trying to investigate and learn about the cause of mysql and progress has been halted.
If mysql2 is the root cause, and there was no need to include a description on the ransack, then this pull request can be closed. My apologies.