add osx install guide #1
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不確定你說的群集版是不是 multi-threads版
如果是的話，是因為安裝的時候缺少 clang-omp++
但是clang-omp又被brew移掉了，所以借用llvm裡面的clang
再加上原生gcc版本是6，但是xgboost 需要的是5
所以要再用 brew install gcc@5
最後就可以直接 pip install xgboost
編譯就會過囉