Add per-os install scripts

install_macos.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env sh
+
+# Install Brew
+if test ! $(which brew); then
+  /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+
+  echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> $HOME/.bash_profile.local
+  echo 'eval "$(/opt/homebrew/bin/brew shellenv)"' >> $ZDOTDIR/.zshrc.local
+  eval "$(/opt/homebrew/bin/brew shellenv)"
+fi
+
+brew update
+
+brew install zsh
+sudo chsh -s $(brew --prefix)/bin/zsh
+brew bundle --file ./macos/Brewfile
+brew bundle --file ./macos/Caskfile