zsh: add /etc/zsh config files for easier unpacking

zsh-etcfiles/etc/zsh/zshrc

@@ -0,0 +1,18 @@
+# Zsh options for all users
+
+# enable extended globbing
+setopt extended_glob
+
+# autoload misc files
+for dotfile in "$ZDOTDIR"/*(D); do
+    source $dotfile
+done
+
+# Check history file
+if [[ ! -f "${HISTFILE}" ]]; then
+    mkdir -p "${HISTFILE%/*}"
+    touch "${HISTFILE}"
+fi
+
+# vim-like keybindings
+bindkey -v